Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Core.ViewModels/SettingsViewModel.cs

@@ -0,0 +1,11 @@
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Core.ViewModels
+{
+    public class SettingsDialogViewModel : CoreBaseViewModel
+    {
+        public SettingsDialogViewModel(IMailDialogService dialogService) 
+        {
+        }
+    }
+}