Update the README

README.md

@@ -13,13 +13,27 @@ This role requires Ansible 1.2 or higher and platform requirements are listed in
 Role Variables
 --------------
 
-You can override the following variables:
+The role uses the following variables:
 
-    # Url to download the composer executable from
-    composer_download_url: https://getcomposer.org/composer.phar
+ - **composer_download_url**: Defines the download url of the composer.phar.
+  Defaults to ```https://getcomposer.org/composer.phar```.
+ - **composer_download_force**: Forces the download on every run.
+  Defaults to ```no```.
 
-    # Force the download on every run
-    composer_download_force: no
+Global Variables
+--------------
+This variables are without a namespace to be used across the entire playbook
+ - **apt_cache_valid_time**: Used for ```cache_valid_time``` in the apt module.
+  Defaults to ```86400```
+
+Example usage
+-------
+
+    ---
+    # file: task.yml
+    - hosts: all
+      roles:
+        - nbz4live.composer
 
 Dependencies
 ------------
@@ -34,4 +48,4 @@ BSD
 Author Information
 ------------------
 
-Sergey Fayngold
+- Sergey Fayngold <sergey@faynhost.com>