Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Calendar/Activation/DefaultActivationHandler.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+using Windows.ApplicationModel.Activation;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Media.Animation;
+using Wino.Activation;
+using Wino.Calendar.Views;
+
+namespace Wino.Calendar.Activation
+{
+    public class DefaultActivationHandler : ActivationHandler<IActivatedEventArgs>
+    {
+        protected override Task HandleInternalAsync(IActivatedEventArgs args)
+        {
+            (Window.Current.Content as Frame).Navigate(typeof(AppShell), null, new DrillInNavigationTransitionInfo());
+
+            return Task.CompletedTask;
+        }
+
+        // Only navigate if Frame content doesn't exist.
+        protected override bool CanHandleInternal(IActivatedEventArgs args)
+            => (Window.Current?.Content as Frame)?.Content == null;
+    }
+}