feat: Added new docs

docusaurus/docs/Flutter/stream_chat/creating_channels.mdx

@@ -4,3 +4,42 @@ sidebar_position: 6
 title: Creating Channels
 ---
 
+Both channel <b>channel.query</b> and  <b>channel.watch</b> methods ensure that a channel exists and create one otherwise.
+If all you need is to ensure that a channel exists, you can use <b>channel.create</b>.
+Typically you use <b>channel.watch</b> client side and <b>channel.create</b> for a server side integration.
+Channels are unique either by the specified channel id or by the list of members.
+
+### Creating a Channel Using a Channel ID
+
+This is typically the best approach if you already have some sort of object in your database that the channel is associated with.
+As an example if you're building a live-streaming service like Twitch you have a channel for every streamer in your database.
+
+```dart
+final channel = client.channel(
+  "messaging",
+  id: "travel",
+  extraData: {
+    "name": "Founder Chat",
+    "image": "http://bit.ly/2O35mws",
+    "members": ["thierry", "tommaso"],
+  },
+);
+```
+
+Note: Note that for client side integrations you'll typically prefer to use channel.watch() instead of channel.create.
+Channel.watch both creates the channel and watches it at the same time.
+
+### Creating a Channel for a List of Members
+
+Channels can be used to create conversations between users.
+In most cases, you want conversations to be unique and make sure that a group of users have only one channel.
+
+You can achieve this by leaving the channel ID empty and provide channel type and members.
+When you do so, the API will ensure that only one channel for the members you specified exists (the order of the members does not matter).
+
+Note: You cannot add/remove members for channels created this way.
+
+```dart
+client.channel("messaging", extraData: {"members": ["thierry", "tommaso"]});
+```
+