public Cities AddCity(Cities city)
{
var existingCity = _citiesRepository.GetFirstWhere(x => x.City.ToLower() == city.City.ToLower().Trim());
if (existingCity != null)
{
throw new FlowException("Градот постои!");
}
ValidateCity(city);
_citiesRepository.Add(city);
_citiesRepository.SaveEntities();
return(city);
}