Create api endpoint for listing user-group

src/Bundle/ChillMainBundle/Controller/UserGroupApiController.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Controller;
+
+use Chill\MainBundle\CRUD\Controller\ApiController;
+
+class UserGroupApiController extends ApiController {}