added control sidebar #10 (#87)

- added configurable sidebar #10
- added language switch in sidebar preferences tab #10
- added sidebar tab with kimai beta-info message #10
- use trait for repositories
- improved README

src/Controller/SidebarController.php

@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of the Kimai package.
+ *
+ * (c) Kevin Papst <kevin@kevinpapst.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Controller;
+
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\Security;
+
+/**
+ * Sidebar controller
+ *
+ * @Security("has_role('ROLE_USER')")
+ *
+ * @author Kevin Papst <kevin@kevinpapst.de>
+ */
+class SidebarController extends AbstractController
+{
+    public function homeAction()
+    {
+        return $this->render('sidebar/home.html.twig', []);
+    }
+
+    public function settingsAction()
+    {
+        return $this->render('sidebar/settings.html.twig', []);
+    }
+}