title: Administration with Cake 3 - Prefix
body: <p>i'm actually at test CakePHP3, and i don't know how do a administration, with Cake 2, in Core we can write </p>
  
  <pre><code>Configure::write('Routing.prefixes', array('admin'));
  </code></pre>
  
  <p>But with CakePHP3, we don't have Core, and in documentation i don't find this code ! I try the routing </p>
  
  <pre><code>Router::prefix('admin', function ($routes) { 
    //My route   
    $routes-&gt;fallbacks('InflectedRoute');
  });
  </code></pre>
  
  <p>but without success ! </p>