Library material was added

StructureHelperLogics/Models/Materials/ElasticMaterial.cs

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+using StructureHelperCommon.Models.Materials;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.Models.Materials
+{
+    public class ElasticMaterial : IElasticMaterial
+    {
+        public double Modulus { get; set; }
+
+        public object Clone()
+        {
+            return new ElasticMaterial() { Modulus = Modulus };
+        }
+
+        public IPrimitiveMaterial GetPrimitiveMaterial()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}