Added documentation from extension page

Author: maxxer

README.md

@@ -5,3 +5,40 @@ Yii i18n-datetime-behavior extension
 Sourced from version 1.1 of http://www.yiiframework.com/extension/i18n-datetime-behavior/
 
 Author: Ricardo Grana <[email protected]>, <[email protected]>
+
+
+This extension is a behavior that can be used in models to allow them to automatically parse and format i18N date formats.
+
+The behavior scans for date and datetime fields in the model attributes, and do the conversions needed.
+
+Documentation 
+=============
+
+Requirements 
+------------
+
+Yii 1.0.9 or above
+You need to have defined your desired language at the entry script.
+Installation 
+
+Extract the release file and put it under protected/extensions
+
+Usage 
+-----
+
+In you model, add the following code:
+```php
+public function behaviors()
+{
+    return array('datetimeI18NBehavior' => array('class' => 'ext.DateTimeI18NBehavior')); // 'ext' is in Yii 1.0.8 version. For early versions, use 'application.extensions' instead.
+}
+```
+IMPORTANT! This behavior changes afterFind and beforeSave events. If your model have to have coding, please, don't forget to add the parent reference:
+```php
+protected function beforeSave(){
+    if (!parent::beforeSave()) return false;
+    ....your code
+}
+```
+The same for afterFind method. Otherwise, this behavior will not make effect.
+