Add value diagram windows and view models

StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/IValueDiagram.cs

@@ -0,0 +1,11 @@
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Models.Shapes;
+
+namespace StructureHelperLogics.NdmCalculations.Analyses.ValueDiagrams
+{
+    public interface IValueDiagram : ISaveable, ICloneable
+    {
+        IPoint2DRange Point2DRange { get; }
+        public int StepNumber { get; set; }
+    }
+}