public function add()
    {
        $this->Crud->on('afterSave', function (Event $event) {
            if ($event->subject->created) {
                $token = [
                    'id' => $event->subject->entity->id,
                    'exp' => time() + 60 * 60 * 24 * 7,
                ];
                $this->set('data', [
                    'id' => $event->subject->entity->id,
                    'token' => JWT::encode($token, Security::salt())
                ]);
                $this->Crud->action()->config('serialize.data', 'data');
            }
            $signupEvent = new Event('Users.afterSignup', $event->subject());
            $this->eventManager()->dispatch($signupEvent);
        });
        return $this->Crud->execute();
    }