[Poll] Added file headers

plugins/Poll/Forms/PollResponseForm.php

@@ -27,6 +27,16 @@ use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 use Symfony\Component\Form\Extension\Core\Type\SubmitType;
 use Symfony\Component\Form\Form as SymfForm;
 
+/**
+ * Form to respond a Poll
+ *
+ * @package  GNUsocial
+ * @category PollPlugin
+ *
+ * @author    Daniel Brandao <up201705812@fe.up.pt>
+ * @copyright 2020 Free Software Foundation, Inc http://www.fsf.org
+ * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
+ */
 class PollResponseForm extends Form
 {
     /**