public Task <UserIdentityDTO> Handle(AddUserIdentityCommand request, CancellationToken cancellationToken)
        {
            var entity = new UserIdentity()
            {
                Email = request.Email, UserName = request.UserName, Password = request.Password
            };
            var response = _commandRepository.AddUserIdentity(entity);

            return(Task.FromResult(new UserIdentityDTO(response)));
        }