add some phpdoc

core/lib/Thelia/Model/ConfigQuery.php

@@ -18,6 +18,16 @@ class ConfigQuery extends BaseConfigQuery
 {
     protected static $cache = array();
 
+    /**
+     *
+     * Find a config variable and return the value or default value if not founded.
+     *
+     * Use this method for better performance, a cache is created for each variable already searched
+     *
+     * @param $search
+     * @param  null  $default
+     * @return mixed
+     */
     public static function read($search, $default = null)
     {
         if (array_key_exists($search, self::$cache)) {