Separation of core library from the UWP app.

Wino.Mail.ViewModels/MailViewModelsContainerSetup.cs

@@ -0,0 +1,14 @@
+using Microsoft.Extensions.DependencyInjection;
+using Wino.Core;
+
+namespace Wino.Mail.ViewModels
+{
+    public static class MailViewModelsContainerSetup
+    {
+        public static void RegisterViewModelService(this IServiceCollection services)
+        {
+            // View models use core services.
+            services.RegisterCoreServices();
+        }
+    }
+}