Added Converter - currently not in use

DelauneyTriangulation/Models/Converters.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Globalization;
+using Avalonia;
+using Avalonia.Data.Converters;
+
+namespace DelauneyTriangulation.Models;
+
+public class Converters
+{
+    
+}
+
+public sealed class EmptyStringIntConverter : IValueConverter
+{
+    public static readonly EmptyStringIntConverter Instance = new();
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture) => value?.ToString();
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        var s = value as string;
+        if (string.IsNullOrWhiteSpace(s)) return 0;
+        return int.TryParse(s, NumberStyles.Integer, culture, out var n) ? n : 0;
+    }
+}