Update README.md with project details, features, requirements, architecture, and data management for PLib video library manager.

src/PLib.Desktop/Program.cs

@@ -0,0 +1,18 @@
+using Avalonia;
+
+namespace PLib.Desktop;
+
+internal static class Program
+{
+    // Avalonia must be initialised before anything touches its types, so keep Main free of
+    // any other work and let App own the application host.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    /// <summary>Also used by the XAML previewer, which requires this exact signature.</summary>
+    public static AppBuilder BuildAvaloniaApp() => AppBuilder.Configure<App>()
+        .UsePlatformDetect()
+        .WithInterFont()
+        .LogToTrace();
+}