Adds docblock

Author: jeremykendall

src/pdp-parse-url.php

@@ -1,5 +1,12 @@
 <?php
 
+/**
+ * PHP Domain Parser: Public Suffix List based URL parsing
+ *
+ * @link      http://github.com/jeremykendall/php-domain-parser for the canonical source repository
+ * @copyright Copyright (c) 2014 Jeremy Kendall (http://about.me/jeremykendall)
+ * @license   http://github.com/jeremykendall/php-domain-parser/blob/master/LICENSE MIT License
+ */
 namespace {
     if (!function_exists('pdp_parse_url')) {
         /**