Add graph application

StructureHelperLogics/Models/Graphs/Graph.cs

@@ -0,0 +1,22 @@
+using StructureHelperLogics.Models.CrossSections;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.Models.Graphs
+{
+    internal class Graph : IGraph
+    {
+        public Guid Id { get; private set; }
+        public Graph()
+        {
+          
+        }
+        public object Clone()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}