Add chapter 10 sample project

Chapter10/TemplateStudioSampleApp/Helpers/EnumToBooleanConverter.cs

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+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Data;
+
+namespace TemplateStudioSampleApp.Helpers;
+
+public class EnumToBooleanConverter : IValueConverter
+{
+    public EnumToBooleanConverter()
+    {
+    }
+
+    public object Convert(object value, Type targetType, object parameter, string language)
+    {
+        if (parameter is string enumString)
+        {
+            if (!Enum.IsDefined(typeof(ElementTheme), value))
+            {
+                throw new ArgumentException("ExceptionEnumToBooleanConverterValueMustBeAnEnum");
+            }
+
+            var enumValue = Enum.Parse(typeof(ElementTheme), enumString);
+
+            return enumValue.Equals(value);
+        }
+
+        throw new ArgumentException("ExceptionEnumToBooleanConverterParameterMustBeAnEnumName");
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language)
+    {
+        if (parameter is string enumString)
+        {
+            return Enum.Parse(typeof(ElementTheme), enumString);
+        }
+
+        throw new ArgumentException("ExceptionEnumToBooleanConverterParameterMustBeAnEnumName");
+    }
+}