A little improvement in installation guide (documentation)

[Juvenildo vaz mendes]

In the installation guide / Configuring AppView could be have an example with initialize method (that is created by default in CakePHP). Something like that (or just a comment about):

namespace App\View;

use LilHermit\Bootstrap4\View\BootstrapView;

class AppView extends BootstrapView
{
    public function initialize()
    {
        parent::initialize();
    }
}

This is not a big problem, but makes me spend a lot of time trying figure out why plugin was not working properly.

[lilHermit]

Not sure this is required because if you don't override initialize then the parent method gets called anyway