feat: initialize Rating.

demo/Ursa.Demo/ViewModels/RatingDemoViewModel.cs

@@ -0,0 +1,20 @@
+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Ursa.Demo.ViewModels;
+
+public partial class RatingDemoViewModel : ViewModelBase
+{
+    [ObservableProperty] private bool _allowClear = true;
+    [ObservableProperty] private bool _allowHalf = true;
+    [ObservableProperty] private bool _allowFocus;
+    [ObservableProperty] private bool _isEnabled = true;
+
+    [ObservableProperty] private double _value;
+
+    // [ObservableProperty] private object _character;
+    [ObservableProperty] private int _count = 10;
+    [ObservableProperty] private double _defaultValue = 5;
+
+    public ObservableCollection<string> Tooltips { get; set; } = ["1", "2", "3", "4", "5"];
+}