feat: add temp template.

demo/Ursa.Demo/ViewModels/FormDemoViewModel.cs

@@ -0,0 +1,43 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace Ursa.Demo.ViewModels;
+
+public partial class FormDemoViewModel: ObservableObject
+{
+    [ObservableProperty] private DataModel _model;
+
+    public FormDemoViewModel()
+    {
+        Model = new DataModel();
+    }
+}
+
+public partial class DataModel : ObservableObject
+{
+    private string _name;
+
+    [MinLength(10)]
+    public string Name
+    {
+        get=>_name;
+        set => SetProperty(ref _name, value);
+    }
+    
+    private string _email;
+    
+    [EmailAddress]
+    public string Email
+    {
+        get=>_email;
+        set => SetProperty(ref _email, value);
+    }
+
+    private DateTime _date;
+    public DateTime Date
+    {
+        get => _date;
+        set => SetProperty(ref _date, value);
+    }
+}