Add new beatmap search filter row "General"

osu.Game/Overlays/BeatmapListing/SearchGeneral.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.
+
+using System.ComponentModel;
+
+namespace osu.Game.Overlays.BeatmapListing
+{
+    public enum SearchGeneral
+    {
+        [Description("Recommended difficulty")]
+        Recommended,
+
+        [Description("Include converted beatmaps")]
+        Converts,
+
+        [Description("Subscribed mappers")]
+        Follows
+    }
+}