Merge core project into winui project.

Wino.Mail.WinUI/Services/ClipboardService.cs

@@ -0,0 +1,18 @@
+using System.Threading.Tasks;
+using Windows.ApplicationModel.DataTransfer;
+using Wino.Core.Domain.Interfaces;
+
+namespace Wino.Mail.WinUI.Services;
+
+public class ClipboardService : IClipboardService
+{
+    public Task CopyClipboardAsync(string text)
+    {
+        var package = new DataPackage();
+        package.SetText(text);
+
+        Clipboard.SetContent(package);
+
+        return Task.CompletedTask;
+    }
+}