Crack Calculator was added

StructureHelperLogics/MaterialBuilders/IPartialFactor.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.MaterialBuilders
+{
+    internal interface IPartialFactor
+    {
+        double YoungsModulus { get; set; }
+        double Compressive { get; set; }
+        double Tensile { get; set; }
+    }
+}