更新客户端渲染，更新了壳

参考/wpfui-main/docs/documentation/about-wpf.md

@@ -0,0 +1,19 @@
+# What is WPF
+
+WPF (Windows Presentation Foundation) is a resolution-independent UI framework for building Windows desktop applications. It provides vector-based graphics, advanced layout, data binding, multimedia, animation, and extensive styling and templating capabilities.
+
+## .NET Framework vs Modern .NET
+
+WPF has two implementations:
+
+**Modern .NET** (.NET 6+): Open-source implementation hosted on GitHub. Provides improved performance, new APIs, side-by-side deployment, and modern tooling. Despite .NET being cross-platform, WPF only runs on Windows.
+
+**.NET Framework 4**: Legacy Windows-only implementation. Maintained for compatibility with existing applications but receives minimal new features.
+
+New WPF applications should target modern .NET (.NET 6 or later) to benefit from:
+
+- Better performance and reduced memory usage
+- Regular updates and new features
+- Modern C# language versions
+- Improved debugging and diagnostics
+- Side-by-side deployment without machine-wide installations