added logo

app/Notifications/FireBaseNotification.php

@@ -36,7 +36,7 @@ class FireBaseNotification extends Notification
             'notification' => [
                 'title'    => 'Notification Title',
                 'body'     => 'Notification Body',
-                'image'    => '', // Optional image URL
+                'image'    => config('app.addr') . '/logo.png', // Optional image URL
             ],
         ];
     }