add guide of certificate/api/create a model (#29472)

* add guide of certificate/api/create a model

* Add syntax highlighting

* Update index.md syntax highlighting

guide/english/certifications/apis-and-microservices/mongodb-and-mongoose/create-a-model/index.md

@@ -3,8 +3,22 @@ title: Create a Model
 ---
 ## Create a Model
 
-This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/apis-and-microservices/mongodb-and-mongoose/create-a-model/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+### Creating Schema
-
+See the [Mongoose docs](https://mongoosejs.com/docs/guide.html) first where is a lot of useful stuff. 
-<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+When you are building schema you can use either of three options for name validation
+```javascript
+name: String
+name: {type: String}
+name: {type: String, required: true} //preferred
+```
+For array of favoriteFoods here is the validation:
+```javascript
+favoriteFoods: [{ type: String }]
+```
+### Creating a Model
+Now that we have the schema of our model, we can actually create a model by:
+```javascript
+var Model  = mongoose.model('Model', modelSchema);
+```
 
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