Icons were added

StructureHelperLogics/NdmCalculations/Cracking/ITensileAreaLogic.cs

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+using LoaderCalculator.Data.Matrix;
+using LoaderCalculator.Data.Ndms;
+using StructureHelperCommon.Models.Forces;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Cracking
+{
+    /// <summary>
+    /// Logic fo calculating of tensile area of RC crosssection
+    /// </summary>
+    public interface ITensileAreaLogic
+    {
+        IEnumerable<INdm> NdmCollection { get; set; }
+        IStrainMatrix StrainMatrix { get; set; }
+        double GetTensileArea();
+    }
+}