symfony3 : add password confirmation field to a password field

in most of the cases its a good idea to let the user confirm is password to prevent uneeded password support.

symfony2 has an own PasswordType in his formpackage.

Include the needed namespaces:
use Symfony\Component\Form\Extension\Core\Type\RepeatedType;
use Symfony\Component\Form\Extension\Core\Type\PasswordType;

add the PassWordType to your form