Add project files.

Examples/Nodify.Calculator/Converters/ItemToListConverter.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace Nodify.Calculator
+{
+    public class ItemToListConverter : IValueConverter
+    {
+        public object? Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (value != null)
+            {
+                var argType = value.GetType();
+                var listType = typeof(List<>).MakeGenericType(argType);
+                var list = Activator.CreateInstance(listType) as IList;
+                list?.Add(value);
+
+                return list;
+            }
+
+            return value;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotSupportedException();
+        }
+    }
+}