Add basic class structure for Beatmap/HitObject/SampleInfo/User.

osu.Game/Beatmaps/Samples/SampleSet.cs

@@ -0,0 +1,13 @@
+//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+namespace osu.Game.Beatmaps.Samples
+{
+    public enum SampleSet
+    {
+        None = 0,
+        Normal = 1,
+        Soft = 2,
+        Drum = 3
+    }
+}