添加Avalonia项目的demo

Serein.Workbench.Avalonia/Api/IFlowEEForwardingService.cs

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+using Serein.Library.Api;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Workbench.Avalonia.Api
+{
+    /// <summary>
+    /// 流程事件管理，转发流程运行环境中触发的事件到工作台各个订阅者
+    /// </summary>
+    internal interface IFlowEEForwardingService : IFlowEnvironmentEvent
+    {
+
+    }
+}