Added file header

src/I18n/Loader/PoFileLoader.php

@@ -1,8 +1,22 @@
 <?php
-
+/**
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         3.0.0
+ * @license       http://www.opensource.org/licenses/mit-license.php MIT License
+ */
 namespace Cake\I18n\Loader;
 
 /**
+ * Parses file in PO format
+ *
  * @copyright Copyright (c) 2010, Union of RAD http://union-of-rad.org (http://lithify.me/)
  * @copyright Copyright (c) 2012, Clemens Tolboom
  * @copyright Copyright (c) 2014, Fabien Potencier https://github.com/symfony/Translation/blob/master/LICENSE