feat: Added new docs

docusaurus/docs/Flutter/stream_chat/silent_messages.mdx

@@ -4,3 +4,34 @@ sidebar_position: 21
 title: Silent Messages
 ---
 
+Sometimes you want to add system or transactional messages to channels such as: "your ride is waiting for you",
+"James updated the information for the trip", "You and Jane are now matched" and so on.
+
+You may not want these messages to mark a channel as unread or increase the unread messages for users.
+
+Silent messages are special messages that don't increase the unread messages count nor mark a channel as unread.
+Creating a silent message is very simple, you only need to include the silent field boolean field and set it to true.
+
+```dart
+final text = 'You completed your trip';
+
+const message = {
+
+    text: text,
+
+    user: systemUser,
+
+    silent: true,
+
+    attachments: tripAttachments,
+
+};
+await channel.sendMessage(message);
+```
+
+<b>Notes: </b>
+
+1.  Existing messages cannot be turned into a silent message or vice versa.
+
+2.  Silent messages do send push notifications by default. To skip our push notification service,
+mark the message with `skip_push: true`.