public User Add([FromBody] User newUser)
        {
            // Log the API call
            _logger.LogInformation("Adding a new user to persistent storage");

            // Get or create the user that matches the passed in username
            var user = _landmarkRepository.GetUser(newUser.Username);

            if (user == null)
            {
                user = _landmarkRepository.AddUser(newUser.Username, newUser.Fullname ?? newUser.Username);
            }

            // Return the freshly created user object
            return(user);
        }