rf3main/backend/modules/common/views/addons/template/Bootstrap.php

<?php

echo "<?php\n";
?>

namespace addons\<?= $model->name;?>\common\components;

use Yii;
use common\interfaces\AddonWidget;

/**
 * Bootstrap
 *
 * Class Bootstrap
 * @package addons\<?= $model->name;?>\common\config<?= "\r";?>
 */
class Bootstrap implements AddonWidget
{
    /**
     * @param $addon
     * @return mixed|void
     */
    public function run($addon)
    {

    }
}