WIP files

BookAStar/BookAStar/Converters/NotValueConverter.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Globalization;
+using Xamarin.Forms;
+
+namespace BookAStar.Converters
+{
+    public class NotValueConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return object.Equals(value, false);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return object.Equals(value, false);
+        }
+    }
+}