Window of calcultion's property is added

StructureHelperLogics/Models/Calculations/CalculationProperties/CalculationProperty.cs

@@ -0,0 +1,27 @@
+using LoaderCalculator.Data.Matrix;
+using StructureHelperLogics.Infrastructures.CommonEnums;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperLogics.Models.Calculations.CalculationProperties
+{
+    public class CalculationProperty : ICalculationProperty
+    {
+        public List<IForceCombination> ForceCombinations { get; set; }
+        public LimitStates LimitState { get; set; }
+        public CalcTerms CalcTerm { get; set; }
+        public IIterationProperty IterationProperty { get; }
+
+        public CalculationProperty()
+        {
+            ForceCombinations = new List<IForceCombination>
+            {
+                new ForceCombination()
+            };
+            LimitState = LimitStates.Collapse;
+            CalcTerm = CalcTerms.ShortTerm;
+            IterationProperty = new IterationProperty() { Accuracy = 0.001d, MaxIterationCount = 100};
+        }
+    }
+}