Crack Calculator was added

StructureHelperLogics/NdmCalculations/Cracking/CrackForceResult.cs

@@ -0,0 +1,19 @@
+using StructureHelperCommon.Models.Calculators;
+using StructureHelperCommon.Models.Forces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Cracking
+{
+    public class CrackForceResult : IResult
+    {
+        public bool IsValid { get; set; }
+        public string Description { get; set; }
+        public bool IsSectionCracked { get; set; }
+        public double ActualFactor { get; set; }
+        public IForceTuple ActualTuple { get; set; }
+    }
+}