LinePrimitive and RectanglePrimitive was added

StructureHelperCommon/Models/Shapes/LineShape.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperCommon.Models.Shapes
+{
+    /// <inheritdoc />
+    public class LineShape : ILineShape
+    {
+        /// <inheritdoc />
+        public ICenter StartPoint { get; set; }
+        /// <inheritdoc />
+        public ICenter EndPoint { get; set; }
+        /// <inheritdoc />
+        public double Thickness { get; set; }
+
+        public LineShape()
+        {
+            StartPoint = new Center();
+            EndPoint = new Center();
+            Thickness = 0;
+        }
+    }
+}