First running version with all fields, sync, m3u generation and without old controller

Tv7Playlist.Core/IPlaylistBuilder.cs

@@ -0,0 +1,10 @@
+using System.IO;
+using System.Threading.Tasks;
+
+namespace Tv7Playlist.Core
+{
+    public interface IPlaylistBuilder
+    {
+        Task<Stream> GeneratePlaylistAsync();
+    }
+}