Initial commit.

Wino.Core/Messages/Mails/SelectedMailItemsChanged.cs

@@ -0,0 +1,8 @@
+namespace Wino.Core.Messages.Mails
+{
+    /// <summary>
+    /// When selected mail count is changed.
+    /// </summary>
+    /// <param name="SelectedItemCount">New selected mail count.</param>
+    public record SelectedMailItemsChanged(int SelectedItemCount);
+}