feat: add transition based number displayer.

demo/Ursa.Demo/ViewModels/NumberDisplayerDemoViewModel.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Windows.Input;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+
+namespace Ursa.Demo.ViewModels;
+
+public partial class NumberDisplayerDemoViewModel: ObservableObject
+{
+    [ObservableProperty] private int _value;
+    [ObservableProperty] private double _doubleValue;
+    public ICommand IncreaseCommand { get; }
+    public NumberDisplayerDemoViewModel()
+    {
+        IncreaseCommand = new RelayCommand(OnChange);
+        Value = 0;
+        DoubleValue = 0d;
+    }
+
+    private void OnChange()
+    {
+        Random r = new Random();
+        Value = r.Next(int.MaxValue);
+        DoubleValue = r.NextDouble() * 100000;
+    }
+}