public IActionResult CreateEmployee(Employee employee)
        {
            var employees = EmployeePersistance.Load();

            employees.Add(new Employee(
                              employee.FirstName,
                              employee.LastName,
                              employee.Address,
                              employee.PhoneNumber,
                              employee.Birthdate
                              ));
            EmployeePersistance.Save(employees);
            return(Redirect("Index"));
        }
        public IActionResult Index()
        {
            var employees = EmployeePersistance.Load();

            return(View(employees));
        }