Update index.md

Add routing of api_login_check

Author: Lidaa

Resources/doc/index.md

@@ -83,6 +83,13 @@ access_control:
     - { path: ^/api,       roles: IS_AUTHENTICATED_FULLY }
 ```
 
+Confgure your `routing.yml` :
+
+``` yaml
+api_login_check:
+   path: /api/login_check
+```
+
 #### Important note for Apache users
 
 As stated in [this link](http://stackoverflow.com/questions/11990388/request-headers-bag-is-missing-authorization-header-in-symfony-2) and [this one](http://stackoverflow.com/questions/19443718/symfony-2-3-getrequest-headers-not-showing-authorization-bearer-token/19445020), Apache server will strip any `Authorization header` not in a valid HTTP BASIC AUTH format.