public async Task <ActionResult> CreateCity(string cityName)
        {
            if (!string.IsNullOrEmpty(cityName))
            {
                rep.Add(new City()
                {
                    Name = cityName
                });
                await Task.Run(() => rep.Save());

                return(Created("restaurants", cityName));
            }
            else
            {
                return(BadRequest());
            }
        }