Window function material done

StructureHelperCommon/Windows/FunctionSelectionVM.cs

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+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Infrastructures.Settings;
+using StructureHelperCommon.Models.Functions;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Windows
+{
+    public class FunctionSelectionVM
+    {
+        public string SHORT_TERM { get; } = "Short Term";
+        public string LONG_TERM { get; } = "Long Term";
+        public string ULS { get; } = "Ultimate Limit State (ULS)";
+        public string SLS { get; } = "Serviceability Limit State (SLS)";
+        public string SPECIAL { get; } = "Special Limit State";
+        public string CREATE_MATERIAL { get; } = "Create Function Material";
+        public ObservableCollection<IOneVariableFunction> Functions { get; set; } = ProgramSetting.Functions;
+    } 
+}