添加Avalonia项目的demo

Serein.Workbench.Avalonia/Custom/Node/ViewModels/NodeViewModelBase.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using Serein.Library;
+using Serein.Workbench.Avalonia.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Workbench.Avalonia.Custom.Node.ViewModels
+{
+    /// <summary>
+    /// 节点ViewModel基类
+    /// </summary>
+    internal abstract class NodeViewModelBase : ViewModelBase
+    {
+        internal abstract NodeModelBase NodeModelBase { get; set; }
+    }
+}