Add function decorator pattern

StructureHelperCommon/Infrastructures/Enums/FunctionType.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Infrastructures.Enums
+{
+    public enum FunctionType
+    {
+        TableFunction,
+        FormulaFunction
+    }
+}