add overriding classes

docs/enhancing-and-overriding/overriding-views.md

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+Overriding Views
+================
+
+In case you need to override the default views (that you surely have to do if you use a different them than default's 
+Bootstrap), Yii2 provides a mechanism that is really easy to do: 
+ 
+```php
+// ... other configuration here
+'components' => [
+    'view' => [
+        'theme' => [
+            'pathMap' => [
+                '@Da/User/resources/views' => '@app/views/user'
+            ]
+        ]
+    ]
+]
+// ...
+```
+
+The above code tells Yii2 to search on `@app/view/user` for views prior to go to `@Da/User/resources/views`. That is, 
+if a view is found on `@app/view/user` that matches the required render it will be displayed instead of the one on 
+`@Da/User/resources/views`. 
+
+You need to remember that the folder structure on your new location must match that of the module. For example, if we 
+wish to override the `login.php` view using the above setting, we would have to create the following structure on our 
+path: 
+
+```
+app  [ Your root ]
+|
+└─ views
+    └─ user
+        └─ security
+             login.php
+```
+
+See how it follows the same structure as within the User's module `resources/views` path? Well, that's what you should 
+do with any of the others in order to override them.
+
+© [2amigos](http://www.2amigos.us/) 2013-2017