Added information about the URL of REST.

An explanation of the #3

Author: githubjeka

README.md

@@ -34,3 +34,21 @@ Demo Client - [http://angularyii2.github.io/](http://angularyii2.github.io/)
 
 Demo Server - [https://yii2-rest-githubjeka.c9.io/rest/web/](https://yii2-rest-githubjeka.c9.io/rest/web/)
 
+Not Found (#404) is OK, because 
+```php
+[
+'urlManager' => [
+            'enablePrettyUrl' => true,
+            'enableStrictParsing' => true,
+            'showScriptName' => false,
+            'rules' => [
+                ['class' => 'yii\rest\UrlRule', 'controller' => ['v1/post', 'v1/comment', 'v2/post']],
+                'OPTIONS v1/user/login' => 'v1/user/login',
+                'POST v1/user/login' => 'v1/user/login',
+                'POST v2/user/login' => 'v2/user/login',
+                'OPTIONS v2/user/login' => 'v2/user/login',
+            ],
+        ],
+ ]
+ ```
+