feat(tools): Add commitizen and cz-freecodecamp (#15589)

CONTRIBUTING.md

@@ -316,13 +316,22 @@ nothing to commit, working directory clean
     add .` to add all unstaged files. Take care, though, because you can
     accidentally add files you don't want added. Review your `git status` first.
 
-6.  Commit your edits: `git commit -m "Brief Description of Commit"`. Do not add the issue number in the commit message.
+6.  Commit your edits (follow any one of the below methods):
+
+    a. Using the inbuilt script (_recommended_):
+       - We have a [tool](https://commitizen.github.io/cz-cli/) that helps you to make standard commit messages. Simply execute `npm run commit` after you have added the necessary files as mentioned in the step earlier.
+
+    b. Using Commitizen CLI:
+       - If you are already using [commitizen](http://commitizen.github.io/cz-cli/), simply doing a `git cz` works as expected too!
 
 7.  Squash your commits, if there are more than one.
 
-8.  Push your commits to your GitHub Fork: `git push -u origin branch/name-here`
+8.  If you would want to add/remove changes to previous commit simply add the files as in Step 5 earlier,
+    and use `git commit --amend` or `git commit --amend --no-edit` (for keeping the same commit message).
 
-9.  Go to [Common Steps](#common-steps)
+9.  Push your commits to your GitHub Fork: `git push -u origin branch/name-here`
+
+10.  Go to [Common Steps](#common-steps)
 
 ##### Method 2: Editing via the GitHub Interface
 

package.json

@@ -27,7 +27,8 @@
     "test-js-server": "tape -r babel-register \"server/**/*.test.js\" | tap-spec",
     "test": "npm run test-js && npm run test-challenges",
     "cover": "babel-node ./node_modules/.bin/babel-istanbul cover tape common/**/*.test.js",
-    "coveralls": "npm run cover && istanbul-coveralls"
+    "coveralls": "npm run cover && istanbul-coveralls",
+    "commit": "git-cz"
   },
   "license": "(BSD-3-Clause AND CC-BY-SA-4.0)",
   "dependencies": {
@@ -138,6 +139,8 @@
     "babel-preset-stage-0": "^6.3.13",
     "browser-sync": "^2.9.12",
     "chunk-manifest-webpack-plugin": "0.1.0",
+    "commitizen": "^2.9.6",
+    "cz-freecodecamp": "^1.0.0",
     "del": "^2.2.0",
     "eslint": "^3.1.0",
     "eslint-plugin-import": "^2.0.1",
@@ -178,5 +181,10 @@
     "webpack-stream": "^3.1.0",
     "yargs": "^7.0.1"
   },
-  "snyk": true
+  "snyk": true,
+  "config": {
+    "commitizen": {
+      "path": "./node_modules/cz-freecodecamp"
+    }
+  }
 }