i'm actually at test CakePHP3, and i don't know how do a administration, with Cake 2, in Core we can write 

```
Configure::write('Routing.prefixes', array('admin'));

```

But with CakePHP3, we don't have Core, and in documentation i don't find this code ! I try the routing 

```
Router::prefix('admin', function ($routes) { 
  //My route   
  $routes->fallbacks('InflectedRoute');
});

```

but without success !