增加MessageBoxService服务

Source/Store.Management.Framework/Services/MessageBoxService/MessageIcon.cs

@@ -0,0 +1,8 @@
+namespace Store.Management.Framework
+{
+	public enum MessageIcon
+	{
+		None, Error, Question, Warning, Information,
+		Hand = Error, Stop = Error, Exclamation = Warning, Asterisk = Information
+	}
+}