Registering module admin in vitrine project

web.php

<?php

$params = require(__DIR__ . '/params.php');

$config = [
    'id' => 'vitrine',
    'basePath' => dirname(__DIR__),
    'bootstrap' => ['log'],
    'language' => 'pt-br',
    'timezone' => 'America/Sao_Paulo',
    'modules' => [
        'admin' => [
            'class' => 'app\modules\admin\Admin',
        ],
    ],
    'components' => [],
];