MDL-36990 mod_feedback - added license comment

mod/feedback/ajax.php

@@ -1,4 +1,26 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Process ajax requests
+ *
+ * @copyright Andreas Grabs
+ * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
+ * @package feedback
+ */
 
 if (!defined('AJAX_SCRIPT')) {
     define('AJAX_SCRIPT', true);