public IActionResult getplaylistbyid(string playlistId)
        {
            if (String.IsNullOrEmpty(playlistId))
            {
                ModelState.AddModelError("error", "Playlist Id required.");
                return(BadRequest(ModelState));
            }

            var response = _iYoutubeService.GetVideosByPlaylistId(playlistId, API_KEY);

            return(Ok(response));
        }