Update notification of successful account registration

app/Http/Controllers/UserController.php

@@ -21,6 +21,7 @@ public function register(RegisterRequest $request){
         $user->phone = $request->phone;
         $user->password = md5($request->password);
         $user->save();
+        return 'Register success';
     }
 
     public function login(LoginRequest $request){