重构中day1，写了很多，不知道怎么说清楚

Workbench/ViewModels/MainViewModel.cs

@@ -0,0 +1,17 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Workbench.ViewModels
+{
+    public class MainViewModel : ObservableObject
+    {
+        public MainViewModel()
+        {
+            
+        }
+    }
+}