added encoding manager interface

MediaBrowser.Controller/MediaEncoding/ChapterImageRefreshOptions.cs

@@ -0,0 +1,17 @@
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Model.Entities;
+using System.Collections.Generic;
+
+namespace MediaBrowser.Controller.MediaEncoding
+{
+    public class ChapterImageRefreshOptions
+    {
+        public Video Video { get; set; }
+
+        public List<ChapterInfo> Chapters { get; set; }
+
+        public bool SaveChapters { get; set; }
+
+        public bool ExtractImages { get; set; }
+    }
+}