LinePrimitive and RectanglePrimitive was added

StructureHelperCommon/Models/Shapes/ILineShape.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Models.Shapes
+{
+    public interface ILineShape : IShape
+    {
+        ICenter StartPoint { get; set; }
+        ICenter EndPoint { get; set; }
+        double Thickness { get; set; }
+    }
+}