title: How to add custom class in laravel 5.4.10
body: <p>I am new in laravel.
  I am writing following code in the controller method.</p>
  
  <pre><code>include_once(app_path() .'/Classes/Pgp_2fa.php');
  $pgp = new Pgp_2fa();
  </code></pre>
  
  <p>Following errors are shown.</p>
  
  <blockquote>
    <p>FatalThrowableError in AuthController.php line 146: Class
    'App\Http\Controllers\Pgp_2fa' not found</p>
  </blockquote>