Add test implementations for Mapsui quickstart guides

[Copilot]

Implements validation infrastructure for Mapsui quickstart guides across multiple .NET UI frameworks.

Implementation

• Test Projects: Avalonia (cross-platform), WPF, and Windows Forms

  • Each follows official quickstart guide precisely
  • Cross-platform build support via EnableWindowsTargeting
  • Platform-specific READMEs

• CI/CD: GitHub Actions workflow validates all projects build on Ubuntu

  • Catches breaking changes in quickstart instructions
  • Minimal permissions (contents: read)

• Documentation: Main README identifies tested platforms vs. platforms requiring manual validation (MAUI, Uno, Blazor, WinUI, Eto, Android, iOS)

Example (Avalonia)

public MainWindow()
{
    InitializeComponent();
    
    var mapControl = new Mapsui.UI.Avalonia.MapControl();
    mapControl.Map?.Layers.Add(Mapsui.Tiling.OpenStreetMap.CreateTileLayer());
    Content = mapControl;
}

Build artifacts excluded via existing .gitignore.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• av-build-tel-api-v1.avaloniaui.net
  • Triggering command: dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Repository to test the quickstart guides

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