CrackWidthCalculator has been added

StructureHelperLogics/NdmCalculations/Cracking/ICrackWidthSimpleCalculatorInputData.cs

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+using StructureHelperCommon.Infrastructures.Enums;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Cracking
+{
+    public interface ICrackWidthSimpleCalculatorInputData
+    {
+        LimitStates LimitState { get; set; }
+        CalcTerms CalcTerm { get; set; }
+        StrainTuple StrainTuple { get; set; }
+        double PsiSFactor { get; set; }
+        /// <summary>
+        /// Length between cracks in meters
+        /// </summary>
+        double Length { get; set; }
+        SectionStressStates StressState { get; set; }
+        RebarPrimitive RebarPrimitive { get; set; }
+    }
+}