public IActionResult CreateEpisode([FromBody] Episode episode)
        {
            if (episode == null)
            {
                return(BadRequest());
            }

            if (episode.Title == string.Empty)
            {
                ModelState.AddModelError("Title", "The title shouldn't be empty");
            }

            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            var createdEpisode = _episodeRepository.AddEpisode(episode);

            return(Created("episode", createdEpisode));
        }