Added warning to Vortex Installer startup

Wabbajack.Lib/VortexInstaller.cs

@@ -31,6 +31,12 @@ namespace Wabbajack.Lib
 
         protected override bool _Begin()
         {
+            MessageBox.Show(
+                "Vortex Support is still experimental and may produce unexpected results. " +
+                "If anything fails go to the special vortex support channels on the discord. @erri120#2285 " +
+                "for support.", "Warning",
+                MessageBoxButton.OK);
+
             ConfigureProcessor(10, RecommendQueueSize());
             Directory.CreateDirectory(DownloadFolder);