Add steel Material

StructureHelperCommon/Models/Materials/Libraries/ISteelDiagramAbsoluteProperty.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace StructureHelperCommon.Models.Materials.Libraries
+{
+    public interface ISteelDiagramAbsoluteProperty : ISteelDiagramProperty
+    {
+        /// <summary>
+        /// Initial modulus of elasticity (Young's modulus), Pa
+        /// </summary>
+        double InitialYoungsModulus { get; set; }
+        /// <summary>
+        /// Stress of yelding, Pa
+        /// </summary>
+        double BaseStrength { get; set; }
+        /// <summary>
+        /// Stress at point of limit of proportionality, Pa
+        /// </summary>
+        double StressOfProportionality { get; set; }
+    }
+}