Add cross-section convert strategies

DataAccess/DTOs/CrossSectionRepositoryDTO.cs

@@ -0,0 +1,29 @@
+using Newtonsoft.Json;
+using StructureHelper.Models.Materials;
+using StructureHelperCommon.Models.Calculators;
+using StructureHelperCommon.Models.Forces;
+using StructureHelperLogics.Models.CrossSections;
+using StructureHelperLogics.NdmCalculations.Primitives;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataAccess.DTOs
+{
+    public class CrossSectionRepositoryDTO : ICrossSectionRepository
+    {
+        [JsonProperty("Id")]        
+        public Guid Id { get; set; }
+        [JsonProperty("HeadMaterials")]        
+        public List<IHeadMaterial> HeadMaterials { get; } = new();
+        [JsonProperty("ForceActions")]        
+        public List<IForceAction> ForceActions { get; } = new();
+        [JsonProperty("Primitives")]        
+        public List<INdmPrimitive> Primitives { get; } = new();
+        [JsonProperty("Calculators")]        
+        public List<ICalculator> Calculators { get; } = new();
+
+    }
+}