feat: add playlist create method without userId

Author: JohnnyCrazy

SpotifyAPI.Web/Clients/Interfaces/IPlaylistsClient.cs

@@ -61,6 +61,17 @@ public interface IPlaylistsClient
     [Obsolete("Use GetPlaylistItems instead, which uses the new GET /playlists/{id}/items endpoint.")]
     Task<Paging<PlaylistTrack<IPlayableItem>>> GetItems(string playlistId, PlaylistGetItemsRequest request, CancellationToken cancel = default);
 
+    /// <summary>
+    /// Create a playlist for the current user. (The playlist will be empty until you add tracks.)
+    /// </summary>
+    /// <param name="request">The request-model which contains required and optional parameters.</param>
+    /// <param name="cancel">The cancellation-token to allow to cancel the request.</param>
+    /// <remarks>
+    /// https://developer.spotify.com/documentation/web-api/reference-beta/#endpoint-create-playlist
+    /// </remarks>
+    /// <returns></returns>
+    Task<FullPlaylist> Create(PlaylistCreateRequest request, CancellationToken cancel = default);
+
     /// <summary>
     /// Create a playlist for a Spotify user. (The playlist will be empty until you add tracks.)
     /// </summary>

SpotifyAPI.Web/Clients/PlaylistsClient.cs

@@ -46,6 +46,13 @@ public Task<Paging<PlaylistTrack<IPlayableItem>>> GetItems(string playlistId, Pl
       return API.Get<Paging<PlaylistTrack<IPlayableItem>>>(URLs.PlaylistTracks(playlistId), request.BuildQueryParams(), cancel);
     }
 
+    public Task<FullPlaylist> Create(PlaylistCreateRequest request, CancellationToken cancel = default)
+    {
+      Ensure.ArgumentNotNull(request, nameof(request));
+
+      return API.Post<FullPlaylist>(URLs.CurrentUserPlaylists(), null, request.BuildBodyParams(), cancel);
+    }
+
     [System.Obsolete("This endpoint (POST /users/{user_id}/playlists) has been removed. Use POST /me/playlists instead.")]
     public Task<FullPlaylist> Create(string userId, PlaylistCreateRequest request, CancellationToken cancel = default)
     {