Implement RankingsSortTabControl component

osu.Game/Overlays/Rankings/RankingsSortTabControl.cs

@@ -0,0 +1,19 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace osu.Game.Overlays.Rankings
+{
+    public class RankingsSortTabControl : OverlaySortTabControl<RankingsSortCriteria>
+    {
+        public RankingsSortTabControl()
+        {
+            Title = "Show";
+        }
+    }
+
+    public enum RankingsSortCriteria
+    {
+        All,
+        Friends
+    }
+}