Add polygon to DTO convert strategy

DataAccess/DTOs/DTOEntities/Shapes/CircleShapeDTO.cs

@@ -0,0 +1,18 @@
+using Newtonsoft.Json;
+using StructureHelperCommon.Models.Shapes;
+
+namespace DataAccess.DTOs
+{
+    public class CircleShapeDTO : ICircleShape
+    {
+        [JsonProperty("Id")]
+        public Guid Id { get; }
+        [JsonProperty("Diameter")]
+        public double Diameter { get; set; }
+
+        public CircleShapeDTO(Guid id)
+        {
+            Id = id;
+        }
+    }
+}