add image encoder based on ffmpeg

MediaBrowser.Controller/MediaEncoding/ImageEncodingOptions.cs

@@ -0,0 +1,18 @@
+
+namespace MediaBrowser.Controller.MediaEncoding
+{
+    public class ImageEncodingOptions
+    {
+        public string InputPath { get; set; }
+        
+        public int? Width { get; set; }
+
+        public int? Height { get; set; }
+
+        public int? MaxWidth { get; set; }
+
+        public int? MaxHeight { get; set; }
+
+        public string Format { get; set; }
+    }
+}