ENG-959: Update docs to encourage using explorer for creating collections (#102)

* Update get-started.mdx

Added this video to show them how to create a simple collection using Explorer to encourage users to use Explorer.

* Update get-started.mdx

I have taken it off from Getting Started as you mentioned. Will now add it over to the Collections and add a new pull request for the same.

* Update collections.mdx

Moved over the SDK Collections code to the Collections section. Let me know if there are any more changes here to be made.

* Created a new heading for Creating Collections Programmatically

* Made the necessary changes as you had mentioned.

* Made a small change to the doc

* Split sections on creating collection

---------

Co-authored-by: Shaki <[email protected]>
Co-authored-by: Shaki150697 <[email protected]>

Author: 3 people

collections.mdx

@@ -18,14 +18,55 @@ action.
 
 ## Create a collection
 
-You can create a collection using the [Explorer](https://explorer.testnet.polybase.xyz) **(recommended)** or by using the client library and calling the `applySchema` method on your polybase instance.
+### Create collection using the Explorer (recommended)
 
-<Info>
-  We recommended you use [Polybase
-  Explorer](https://explorer.testnet.polybase.xyz) to create your Collection. You will need to first login 
-  and create an account.
-</Info>
+Navigate to the [Explorer](https://explorer.testnet.polybase.xyz), and click on "Create Collection". You will then be prompted to sign in.
+
+If you create a collection in the explorer, the collection will be owned by the account you used to sign in.
+
+
+### Create collection programmatically
+
+To create a schema programatically, you can use the `applySchema` method on your Polybase client instance.
+
+In this example, we create a collection called `City` that has `name` and `country` fields, and a `setCountry()` function. You can define multiple collections in a single `applySchema` call.
+
+```js
+import { Polybase } from "@polybase/client"
+
+const db = new Polybase({ defaultNamespace: "your-namespace" })
+
+await db.applySchema(`
+  @public
+  collection City {
+    id: string;
+    name: string;
+    country?: string;
+
+    constructor (id: string, name: string) {
+      this.id = id;
+      this.name = name;
+    }
+
+    setCountry (country: string) {
+      this.country = country;
+    }
+  }
 
+  @public
+  collection Country {
+    id: string;
+    name: string;
+
+    constructor (id: string, name: string) {
+      this.id = id;
+      this.name = name;
+    }
+  }
+`,
+  "your-namespace"
+); // your-namespace is optional if you have defined a default namespace
+```
 
 <Warning>
   If you use `applySchema` you will need to sign the request [sign the request](https://docs.polybase.xyz/write#signing-requests), and 

get-started.mdx

@@ -49,13 +49,18 @@ const db = polybase.Polybase({
 
 ## Create a collection
 
-Create collections using [Polybase Explorer](https://explorer.testnet.polybase.xyz) or the JavaScript SDK.
+Create collections using [Polybase Explorer](https://explorer.testnet.polybase.xyz) or the JavaScript SDK (`@polybase/client`).
+
+Watch Shaki create a simple collection using the Polybase Explorer. 
+<iframe width="560" height="315" src="https://www.youtube.com/embed/EKHD7i1y4jc" title="Defining a collection in Polybase Explorer" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
 
 <Info>
 We suggest creating collections using [Polybase Explorer](https://explorer.testnet.polybase.xyz). You will need to first login and create an account.
 </Info>
 
-A Polybase collection describes the rules for a collection of data, not just a single record (as is the case with other smart collection languages).
+## Create a collection programmatically
+
+If you want to create your collection programatically, see [Creating collection with applySchema](/collections#).
 
 In this example we use the JavaScript SDK to create a collection called `City` that has `name` and `country` fields, and a `setCountry()` function. You can define multiple 
 collections in a single `applySchema` call.
@@ -93,7 +98,9 @@ await db.applySchema(`
 ); // your-namespace is optional if you have defined a default namespace
 ```
 
-For more details on creating collections, see the [collection](/collections) overview.
+You can create a collection using the [Explorer](https://explorer.testnet.polybase.xyz) **(recommended)** or by using the client library and calling the `applySchema` method on your polybase instance.
+
+A Polybase collection describes the rules for a collection of data, not just a single record (as is the case with other smart collection languages).
 
 ## Create a collection record
 
@@ -149,4 +156,4 @@ const data = await db.collection("City").record("new-york").get();
 </Card>
 
 <Card title="Read the Polybase Whitepaper" icon="file-lines" href="https://polybase.xyz/whitepaper">
-</Card>
+</Card>