Improve README.md with configuration settings

README.md

@@ -3,6 +3,26 @@ RedisArray Cache Storage Adapter for ZF2
 
 This is RedisArray Cache Storage Adapter component for ZF2 inspired by \Zend\Cache\Storage\Adapter\Redis
 
+Installation
+------------
+
+This module only officially supports installation through Composer. For Composer documentation, please refer to
+[getcomposer.org](http://getcomposer.org/).
+
+You can install the module from command line:
+```sh
+$ php composer.phar require smoke/zf2-cache-storage-redis-array:1.0.*
+```
+
+Alternatively, you can also add manually the dependency in your `composer.json` file:
+```json
+{
+    "require": {
+        "smoke/zf2-cache-storage-redis-array": "1.0.*"
+    }
+}
+```
+
 Configuration settings
 ------------------------