add comment explaining back-end challenges don't need a solution (#37111)

* add solution to a challenge

add solution to the challenge: add-a-description-to-your-package-json

* add comment to all backend challenges
The comment expllains that these challenges don't need a solution.

curriculum/challenges/english/05-apis-and-microservices/apis-and-microservices-projects/exercise-tracker.english.md

@@ -47,7 +47,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/apis-and-microservices-projects/file-metadata-microservice.english.md

@@ -41,7 +41,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/apis-and-microservices-projects/request-header-parser-microservice.english.md

@@ -39,7 +39,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/apis-and-microservices-projects/timestamp-microservice.english.md

@@ -49,7 +49,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/apis-and-microservices-projects/url-shortener-microservice.english.md

@@ -43,7 +43,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/chain-middleware-to-create-a-time-server.english.md

@@ -52,7 +52,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/get-data-from-post-requests.english.md

@@ -46,7 +46,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/get-query-parameter-input-from-the-client.english.md

@@ -40,7 +40,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/get-route-parameter-input-from-the-client.english.md

@@ -39,7 +39,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/implement-a-root-level-request-logger-middleware.english.md

@@ -48,7 +48,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/meet-the-node-console.english.md

@@ -41,7 +41,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/serve-an-html-file.english.md

@@ -43,7 +43,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/serve-json-on-a-specific-route.english.md

@@ -37,7 +37,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/serve-static-assets.english.md

@@ -37,7 +37,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/start-a-working-express-server.english.md

@@ -47,7 +47,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/use-body-parser-to-parse-post-requests.english.md

@@ -50,7 +50,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/basic-node-and-express/use-the-.env-file.english.md

@@ -38,7 +38,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/add-a-description-to-your-package.json.english.md

@@ -44,7 +44,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/add-a-license-to-your-package.json.english.md

@@ -42,7 +42,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/add-a-version-to-your-package.json.english.md

@@ -41,7 +41,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/add-keywords-to-your-package.json.english.md

@@ -47,7 +47,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/expand-your-project-with-external-packages-from-npm.english.md

@@ -49,7 +49,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/how-to-use-package.json-the-core-of-any-node.js-project-or-npm-package.english.md

@@ -44,7 +44,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/manage-npm-dependencies-by-understanding-semantic-versioning.english.md

@@ -48,7 +48,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/remove-a-package-from-your-dependencies.english.md

@@ -39,7 +39,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/use-the-caret-character-to-use-the-latest-minor-version-of-a-dependency.english.md

@@ -46,7 +46,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/managing-packages-with-npm/use-the-tilde-character-to-always-use-the-latest-patch-version-of-a-dependency.english.md

@@ -46,7 +46,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/chain-search-query-helpers-to-narrow-search-results.english.md

@@ -36,7 +36,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/create-a-model.english.md

@@ -65,7 +65,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/create-and-save-a-record-of-a-model.english.md

@@ -45,7 +45,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/create-many-records-with-model.create.english.md

@@ -36,7 +36,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/delete-many-documents-with-model.remove.english.md

@@ -37,7 +37,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/delete-one-document-using-model.findbyidandremove.english.md

@@ -36,7 +36,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/install-and-set-up-mongoose.english.md

@@ -41,7 +41,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/perform-classic-updates-by-running-find-edit-then-save.english.md

@@ -40,7 +40,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/perform-new-updates-on-a-document-using-model.findoneandupdate.english.md

@@ -37,7 +37,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/use-model.find-to-search-your-database.english.md

@@ -37,7 +37,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/use-model.findbyid-to-search-your-database-by-id.english.md

@@ -35,7 +35,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>

curriculum/challenges/english/05-apis-and-microservices/mongodb-and-mongoose/use-model.findone-to-return-a-single-matching-document-from-your-database.english.md

@@ -36,7 +36,11 @@ tests:
 <section id='solution'>
 
 ```js
-// solution required
+/**
+  Backend challenges don't need solutions, 
+  because they would need to be tested against a full working project. 
+  Please check our contributing guidelines to learn more.
+*/
 ```
 
 </section>