Add project files.

UI/WPF.Controls/ProgressRing/ProgressRingTemplateSettings.cs

@@ -0,0 +1,16 @@
+using System.Windows;
+
+namespace TheXamlGuy.UI.WPF.Controls;
+
+public class ProgressRingTemplateSettings : DependencyObject
+{
+    public static readonly DependencyProperty EndAngleProperty =
+        DependencyProperty.Register(nameof(EndAngle),
+            typeof(double), typeof(ProgressRingTemplateSettings));
+
+    public double EndAngle
+    {
+        get => (double)GetValue(EndAngleProperty);
+        set => SetValue(EndAngleProperty, value);
+    }
+}