ConcreteBucklingCalculator was added

StructureHelperLogics/NdmCalculations/Buckling/IBucklingOptions.cs

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+using StructureHelperCommon.Infrastructures.Enums;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperCommon.Models.Sections;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Buckling
+{
+    public interface IBucklingOptions
+    {
+        ICompressedMember CompressedMember { get; }
+        LimitStates LimitState { get; }
+        CalcTerms CalcTerm { get; }
+        IEnumerable<INdmPrimitive> Primitives { get; }
+        IForceTuple CalcForceTuple { get; }
+    }
+}