Added a license header.

Author: QuickWrite

includes/MultiCodeBlockBuilder.php

@@ -1,4 +1,11 @@
 <?php
+/**
+ * This file is part of MultiCodeBlock.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 require_once __DIR__ . '/vendor/autoload.php';
 
 require_once 'class/Description.php';