Update Readme how to use channels

README.md

@@ -735,3 +735,39 @@ fetch('https://fcm.googleapis.com/fcm/send', {
     })
 })
 ```
+
+## Channels
+
+Right now for Android Orion 8 or API 26 is important to use channels. To make it working first of all add default meta data to `AndroidManifest`:
+
+```
+<meta-data android:name="com.google.firebase.messaging.default_notification_channel_id" android:value="@string/default_notification_channel_id"/>
+```
+
+Now you should `createNotificationChannel` on init app. Its creates if not exists yet.
+
+```
+FCM.createNotificationChannel({
+    id: 'car_status',
+    name: 'Car status',
+    description: 'Notifies when changes car status',
+    priority: 'max',
+});
+```
+
+After this all notifications should have `channel` key and value with specified channel name. For example:
+
+```
+customNotification = {
+   id: 'id',
+   title: `title`,
+   body: 'body',
+   sound: 'default',
+   priority: 'high',
+   icon: 'ic_launcher',
+   show_in_foreground: true,
+   vibrate: 500,
+    channel: 'car_status',
+   action: 'android.intent.action.MAIN',
+};
+```