Project creation, basics

TimetableDesigner.MessageBox/MessageBoxYesNoCancelResult.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TimetableDesigner.MessageBox
+{
+    public enum MessageBoxYesNoCancelResult
+    {
+        Yes,
+        No,
+        Cancel,
+        None
+    }
+}