add project language api

Author: Dickriven Chellemboyee

lib/Gitlab/Api/Projects.php

@@ -496,6 +496,17 @@ public function removeLabel($project_id, $name)
         ));
     }
 
+    /**
+     * Get languages used in a project with percentage value.
+     *
+     * @param int $project_id
+     * @return void
+     */
+    public function languages($project_id)
+    {
+        return $this->get($this->getProjectPath($project_id, 'languages'));
+    }
+
     /**
      * @param int $project_id
      * @param array $params (