Add the possibility to create a comment when a task is sent by email

app/Controller/TaskMailController.php

@@ -33,6 +33,15 @@ class TaskMailController extends BaseController
         if ($valid) {
             $this->sendByEmail($values, $task);
             $this->flash->success(t('Task sent by email successfully.'));
+
+            if (isset($values['add_comment']) && $values['add_comment'] == 1) {
+                $this->commentModel->create(array(
+                    'comment' => t('This task was sent by email to "%s" with subject "%s".', $values['email'], $values['subject']),
+                    'user_id' => $this->userSession->getId(),
+                    'task_id' => $task['id'],
+                ));
+            }
+
             $this->response->redirect($this->helper->url->to('TaskViewController', 'show', array('task_id' => $task['id'], 'project_id' => $task['project_id']), 'comments'), true);
         } else {
             $this->create($values, $errors);