Add value diagram windows and view models

StructureHelperLogics/NdmCalculations/Analyses/ValueDiagrams/ValueDiagramEntity.cs

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+namespace StructureHelperLogics.NdmCalculations.Analyses.ValueDiagrams
+{
+    public class ValueDiagramEntity : IValueDiagramEntity
+    {
+        public Guid Id { get; }
+        public string Name { get; set; } = string.Empty;
+        public bool IsTaken { get; set; } = true;
+
+        public IValueDiagram ValueDigram { get; set; } = new ValueDiagram(Guid.NewGuid());
+
+        public ValueDiagramEntity(Guid id)
+        {
+            Id = id;
+        }
+
+        public object Clone()
+        {
+            ValueDiagramEntity newItem = new ValueDiagramEntity(Guid.NewGuid());
+            var updateStrategy = new ValueDiagramEntityUpdateStrategy();
+            updateStrategy.Update(newItem, this);
+            return newItem;
+        }
+    }
+}