Add tree graph commands

StructureHelperCommon/Models/Functions/GraphPoint.cs

@@ -6,9 +6,20 @@ using System.Threading.Tasks;
 
 namespace StructureHelperCommon.Models.Functions
 {
-    public class GraphPoint
+    public class GraphPoint : ICloneable
     {
         public double X { get; set; }
         public double Y { get; set; }
+
+        public GraphPoint(double x, double y)
+        {
+            X = x;
+            Y = y;
+        }
+        public object Clone()
+        {
+            var clone = new GraphPoint(X,Y);
+            return clone;
+        }
     }
 }