public async Task <IActionResult> Authorize(AuthorizationModel model)
        {
            var user = await _usersService.Authorize(model.Username, model.Password);

            if (user == null)
            {
                ModelState.AddModelError("", "Неверные имя пользователя или пароль");
                return(View("Index"));
            }
            await _signInManager.SignInAsync(user, true);


            return(RedirectToAction("Index", "Products"));
        }