Add steel Material

StructureHelperCommon/Models/Materials/Libraries/SteelDiagramAbsoluteProperty.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperCommon.Models.Materials.Libraries
+{
+    /// <inheritdoc/>
+    public class SteelDiagramAbsoluteProperty : ISteelDiagramAbsoluteProperty
+    {
+        /// <inheritdoc/>
+        public double InitialYoungsModulus { get; set; }
+        /// <inheritdoc/>
+        public double BaseStrength { get; set; }
+        /// <inheritdoc/>
+        public double StrainOfProportionality { get; set; }
+        /// <inheritdoc/>
+        public double StrainOfStartOfYielding { get; set; }
+        /// <inheritdoc/>
+        public double StrainOfEndOfYielding { get; set; }
+        /// <inheritdoc/>
+        public double StrainOfUltimateStrength { get; set; }
+        /// <inheritdoc/>
+        public double StrainOfFracture { get; set; }
+        /// <inheritdoc/>
+        public double StressOfProportionality { get; set; }
+        /// <inheritdoc/>
+        public double StressOfUltimateStrength { get; set; }
+        /// <inheritdoc/>
+        public double StressOfFracture { get; set; }
+    }
+}