/**
     * @Route("/rejestracja", name="user_registration")
     */
    public function register(Request $request, UserPasswordEncoderInterface $passwordEncoder)
    {
        $user = new AppUser();
        $form = $this->createForm(AppUserType::class, $user);

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {

            $password = $passwordEncoder->encodePassword($user, $user->getPlainPassword());
            $user->setPassword($password);
            $user->eraseCredentials();
            $entityManager = $this->getDoctrine()->getManager();
            $entityManager->persist($user);
            $entityManager->flush();

            return $this->redirectToRoute('main');
        }

        return $this->render('security/register.html.twig', [
            'controller_name'   =>  'registration',
            'form' => $form->createView(),
        ]);
    }