add wind up and wind down mods

osu.Game.Rulesets.Catch/CatchRuleset.cs

@@ -99,6 +99,11 @@ namespace osu.Game.Rulesets.Catch
                         new MultiMod(new CatchModAutoplay(), new ModCinema()),
                         new CatchModRelax(),
                     };
+                case ModType.Fun:
+                    return new Mod[]
+                    {
+                        new MultiMod(new CatchModWindUp(), new CatchModWindDown())
+                    };
                 default:
                     return new Mod[] { };
             }

osu.Game.Rulesets.Catch/Mods/CatchModWindDown.cs

@@ -0,0 +1,11 @@
+using System;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Catch.Objects;
+
+namespace osu.Game.Rulesets.Catch.Mods
+{
+    public class CatchModWindDown : ModWindDown<CatchHitObject>
+    {
+        
+    }
+}

osu.Game.Rulesets.Catch/Mods/CatchModWindUp.cs

@@ -0,0 +1,11 @@
+using System;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Catch.Objects;
+
+namespace osu.Game.Rulesets.Catch.Mods
+{
+    public class CatchModWindUp : ModWindUp<CatchHitObject>
+    {
+        
+    }
+}