[FindMyMouse]Do not activate on game mode (#13990)

* [FindMyMouse] Do not activate on game mode

* Add settings scaffolding

* fix spellchecker

* Address PR comments

* Adress UI feedback

src/settings-ui/Microsoft.PowerToys.Settings.UI.Library/FindMyMouseProperties.cs

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json.Serialization;
+
+namespace Microsoft.PowerToys.Settings.UI.Library
+{
+    public class FindMyMouseProperties
+    {
+        [JsonPropertyName("do_not_activate_on_game_mode")]
+        public BoolProperty DoNotActivateOnGameMode { get; set; }
+
+        public FindMyMouseProperties()
+        {
+            DoNotActivateOnGameMode = new BoolProperty(true);
+        }
+    }
+}