public async Task RegisterAsync(string pesel, string password, string name)
{
var personnel = await personnelRepository.GetAsync(pesel);
if (personnel != null)
{
throw new UserAlreadyExistsException("User with that pesel already exists");
}
var salt = encrypter.GetSalt(password);
var hash = encrypter.GetHash(password, salt);
personnel = new Personnel(pesel, hash, salt, name);
await personnelRepository.RegisterAsync(personnel);
}