重构中day1，写了很多，不知道怎么说清楚

Workbench/Services/ProjectService.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Workbench.Services
+{
+    internal class ProjectService
+    {
+
+    }
+}