mark single notification as read

lib/data/repositories/notification_repository.dart

@@ -39,4 +39,10 @@ class NotificationsRepository {
       offset: offset,
     );
   }
+
+  Future<Result<NotificationResponseModel>> markAsRead({
+    required String notificationId,
+  }) {
+    return _notificationsService.markAsRead(notificationId: notificationId);
+  }
 }