Implement the freemod selection overlay

osu.Game.Tests/Visual/Multiplayer/TestSceneFreeModSelectOverlay.cs

@@ -0,0 +1,21 @@
+// 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 NUnit.Framework;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Screens.OnlinePlay;
+
+namespace osu.Game.Tests.Visual.Multiplayer
+{
+    public class TestSceneFreeModSelectOverlay : MultiplayerTestScene
+    {
+        [SetUp]
+        public new void Setup() => Schedule(() =>
+        {
+            Child = new FreeModSelectOverlay
+            {
+                State = { Value = Visibility.Visible }
+            };
+        });
+    }
+}