adding methods isAdmin() and isUser()
adding methods isAdmin() and isUser() to UserService file
creation of controller "SignInController" for access the app
ceation of a new user
update of hibernate.cfg.xml
update views
change attribute idUser by id, adding user_name attribute
adding controller to modify user and admin
changes in UserController
web.xml
adding changes to pom.xml file
modificando los pom para que funcione