QuickTabsListController.php

<?php


/**
 * @file
 * Contains \Drupal\quicktabs\Controller\QuickTabsListController.
 */
namespace Drupal\quicktabs\Controller;

use Drupal\Core\Controller\ControllerBase;

/**
 * Class QuickTabsListController
 */
class QuickTabsListController extends ControllerBase {
    
    /**
     * {@inheritdoc}
     */
    public function content() {
        $build = array(
            '#type' => 'markup',
            '#markup' => t('Hello World'),
        );
        return $build;
    }

}