feat: add two tone icon.

demo/Ursa.Demo/ViewModels/MainViewViewModel.cs

@@ -43,6 +43,7 @@ public class MainViewViewModel : ViewModelBase
             MenuKeys.MenuKeyRangeSlider => new RangeSliderDemoViewModel(),
             MenuKeys.MenuKeyTagInput => new TagInputDemoViewModel(),
             MenuKeys.MenuKeyTimeline => new TimelineDemoViewModel(),
+            MenuKeys.MenuKeyTwoTonePathIcon => new TwoTonePathIconDemoViewModel(),
         };
     }
 }

demo/Ursa.Demo/ViewModels/MenuViewModel.cs

@@ -30,6 +30,7 @@ public class MenuViewModel: ViewModelBase
             new() { MenuHeader = "RangeSlider", Key = MenuKeys.MenuKeyRangeSlider, Status = "New"},
             new() { MenuHeader = "TagInput", Key = MenuKeys.MenuKeyTagInput },
             new() { MenuHeader = "Timeline", Key = MenuKeys.MenuKeyTimeline, Status = "Updated" },
+            new() { MenuHeader = "TwoTonePathIcon", Key = MenuKeys.MenuKeyTwoTonePathIcon, Status = "New"},
         };
     }
 }

demo/Ursa.Demo/ViewModels/TwoTonePathIconDemoViewModel.cs

@@ -0,0 +1,8 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Ursa.Demo.ViewModels;
+
+public class TwoTonePathIconDemoViewModel:ObservableObject
+{
+    
+}