Add value diagram calculator saving

DataAccess/DTOs/DTOEntities/ValueDiagrams/ValueDiagramDTO.cs

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+using Newtonsoft.Json;
+using StructureHelperCommon.Models.Shapes;
+using StructureHelperLogics.NdmCalculations.Analyses.ValueDiagrams;
+
+namespace DataAccess.DTOs
+{
+    public class ValueDiagramDTO : IValueDiagram
+    {
+        [JsonProperty("Id")]
+        public Guid Id { get; }
+        [JsonProperty("Point2DRange")]
+        public IPoint2DRange Point2DRange { get; set; }
+        [JsonProperty("StepNumber")]
+        public int StepNumber { get; set; }
+
+        public ValueDiagramDTO(Guid id)
+        {
+            Id = id;
+        }
+
+        public object Clone()
+        {
+            return this;
+        }
+    }
+}