add Rating to EXIF as well just in case that matters somehow

Program.cs

@@ -232,7 +232,6 @@ public class Photo {
     Directory.CreateDirectory(directory);
     string filename = System.IO.Path.Combine(directory, System.IO.Path.GetFileName(Filename));
     Console.WriteLine("saving " + filename);
-    // FIXME: what if we also saved Exif rating?
     // FIXME: add comments / captions as ImageDescription?
     // FIXME: strip some Exif tags for privacy reasons?
     // FIXME: warn if the file already exists?
@@ -244,6 +243,7 @@ public class Photo {
       exif.SetValue<string>(ExifTag.Artist, "Colin McMillen");
       exif.SetValue<string>(ExifTag.Copyright, "Colin McMillen");
       exif.SetValue<string>(ExifTag.Software, "Totte");
+      exif.SetValue<ushort>(ExifTag.Rating, (ushort) Rating);
       DateTime now = DateTime.Now;
       string datetime = String.Format(
         "{0:D4}:{1:D2}:{2:D2} {3:D2}:{4:D2}:{5:D2}",