Add BackendController/AccesControl

Add the BackendController for all the backend controllers.
Add AccesControl

backend/controllers/BackendController.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace backend\controllers;
+
+use Yii;
+use common\models\City;
+use backend\models\CitySearch;
+use yii\web\Controller;
+use yii\web\NotFoundHttpException;
+use yii\filters\VerbFilter;
+use yii\base\Object;
+use yii\db\Query;
+use yii\helpers\Json;
+
+/**
+ * CityController implements the CRUD actions for City model.
+ */
+class BackendController extends Controller
+{
+
+	public function behaviors()
+    {
+        return [
+        		'access' => [
+        				'class' => \yii\filters\AccessControl::className(),
+        				'rules' => [
+        						// allow authenticated users
+        						[
+        								'actions' => ['create','index','view','update'],
+        								'allow' => true,
+        								'roles' => ['@'],
+        						],
+        						// everything else is denied
+        				],
+        		],
+        ];
+    }
+
+    
+}