Add curvature calculator DTOs

StructureHelperLogics/NdmCalculations/Analyses/Curvatures/CurvatureCalculatorResult.cs

@@ -0,0 +1,12 @@
+namespace StructureHelperLogics.NdmCalculations.Analyses.Curvatures
+{
+    public class CurvatureCalculatorResult : ICurvatureCalculatorResult
+    {
+        public ICurvatureCalculatorInputData InputData { get; set; }
+
+        public List<ICurvatureForceCalculatorResult> ForceCalculatorResults { get; } = [];
+
+        public bool IsValid { get; set; } = true;
+        public string? Description { get; set; } = string.Empty;
+    }
+}