docs(messaging): Added a Section for Getting FCM Device Tokens (#6387)

* Added a Section for Getting FCM Device Tokens

Co-authored-by: Mike Hardy <[email protected]>

Author: Bilal-Abdeen

docs/messaging/notifications.md

@@ -169,6 +169,16 @@ If it's called too soon (e.g. within a class constructor or global scope), the n
 
 **Quick Tip:** On `Android` you can test receiving remote notifications on the emulator but on `iOS` you will need to use a real device as the iOS simulator does not support receiving remote notifications.
 
+# Getting a Device Token
+
+To send messages to a device, you would need the FCM token for it, which you can get using the `messaging().getToken()` method. An example is available on '[Notifee pages](https://notifee.app/react-native/docs/integrations/fcm)'.
+
+```jsx
+await messaging().registerDeviceForRemoteMessages();
+const token = await messaging().getToken();
+// save the token to the db
+```
+
 # Advanced Local Notifications
 
 FCM provides support for displaying basic notifications to users with minimal integration required. If however you require