added xmldoc

StabilityMatrix.Avalonia/Models/AppArgs.cs

@@ -77,6 +77,10 @@ public class AppArgs
     [Option("data-dir", HelpText = "Override data directory")]
     public string? DataDirectoryOverride { get; set; }
 
+    /// <summary>
+    /// Launch an installed package on startup
+    /// Can use package ID or name
+    /// </summary>
     [Option("launch-package", HelpText = "Package ID or name to launch on startup")]
     public string? LaunchPackageName { get; set; }