Added WPF tester

EonaCat.VolumeMixer.Tester.WPF/App.xaml.cs

@@ -0,0 +1,14 @@
+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace EonaCat.VolumeMixer.Tester.WPF
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+
+}