Library material was added

StructureHelperLogics/Models/Materials/IHeadMaterialRepository.cs

@@ -0,0 +1,19 @@
+using StructureHelper.Models.Materials;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml.Serialization;
+
+namespace StructureHelperLogics.Models.Materials
+{
+    public interface IHeadMaterialRepository
+    {
+        object Parent { get; }
+        List<IHeadMaterial> HeadMaterials { get; set; }
+        List<ILibMaterial> LibMaterials { get; set; }
+        void RegisterParent(object obj);
+
+    }
+}