public void CreateUser()
        {
            LoginOrSignup CreateNewUser = new LoginOrSignup(DataProvider);
            User          u2            = new User()
            {
                Username       = CreateNewUser.ReadUsername(),
                Password       = CreateNewUser.ReadPassword(),
                UsersPrivilege = Privilege.user
            };

            DataProvider.CreateUser(u2);
            Console.WriteLine($"User \"{u2.Username}\" has been created!");
        }
        static void Main(string[] args)
        {
            IProvideData  DataReader = new ReadDataFromDatabase();
            LoginOrSignup LogOrSign  = new LoginOrSignup(DataReader);

            while (true)
            {
                User ActiveUser = LogOrSign.LoginSignup(DataReader);
                using (MainMenu ConsoleMainMenu = new MainMenu(DataReader, ActiveUser))
                {
                    ConsoleMainMenu.ShowMenu();
                }
            }
        }