feat: Added new docs

docusaurus/docs/Flutter/stream_chat/deleting_and_hiding_channel.mdx

@@ -4,3 +4,34 @@ sidebar_position: 13
 title: Deleting And Hiding A Channel
 ---
 
+### Deleting a Channel
+
+You can delete a Channel using the delete method. This marks the channel as deleted and hides all the content.
+
+```dart
+await channel.delete();
+```
+
+Note: If you recreate this channel, it will show up empty. Recovering old messages is not currently supported via the Stream Chat API.
+
+### Hiding a Channel
+
+Hiding a channel will remove it from query channel requests for that user until a new message is added.
+Please keep in mind that hiding a channel is only available to members of that channel.
+
+Optionally you can also clear the entire message history of that channel for the user.
+This way, when a new message is received, it will be the only one present in the channel.
+
+```dart
+// hides the channel until a new message is added there
+await channel.hide();
+
+// shows a previously hidden channel
+await channel.show();
+
+// hide the channel and clear the message history
+await channel.hide(clearHistory: true);
+```
+
+Note: You can still retrieve the list of hidden channels using the { "hidden" : true } query parameter.
+