Rework extension's README.md file as entry point for marketplaces

- Give only basic overview for users
- Show screenshot of extension in action
- Link to documentation + feature tour

Author: Rpinski

vscode-extension/README.md

@@ -1,42 +1,19 @@
-# ilspy-vscode (Extension)
+# ILSpy Visual Studio Code Extension
 
-This is the actual VSCode extension part of the project, which fulfills following tasks:
+The ILSpy extension for VS Code is a cross-platform implementation of ILSpy .NET assembly browser and decompiler running inside of Visual Studio Code - in contrast to the [ILSpy desktop application](https://github.com/icsharpcode/ILSpy) running standalone on Windows systems.
 
-* Integrates ILSpy UI elements (like Assembly Tree, Search and Analyze panels, palette commands) into VSCode shell
-* Manages extension settings (global and workspace-specific)
-* Controls [backend](../backend/README.md) process launching it at startup and initializing it with configuration
-* Installs a required version of .NET runtime using Microsoft's [.NET Install Tool for Extension Authors](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.vscode-dotnet-runtime)
+![ILSpy VS Code Extension](https://raw.githubusercontent.com/icsharpcode/ilspy-vscode/tree/master/vscode-extension/docs/extension-view.png)
 
-A description of the extension's features can be found in [Feature Tour](https://github.com/icsharpcode/ilspy-vscode/wiki/Feature-Tour).
+## Getting Started
 
-## Export decompiled code
+* [Installation](https://github.com/icsharpcode/ilspy-vscode/wiki/Installation)
+* [Feature Tour](https://github.com/icsharpcode/ilspy-vscode/wiki/Feature-Tour)
 
-To export all decompiled code of a loaded assembly, right-click the assembly node in the `ILSpy: Assemblies` view and run `Export Decompiled Code...`. This will generate a complete C# project including:
-- All decompiled source files organized by namespace
-- A .csproj project file for easy compilation
+See the [Feature Comparison List](https://github.com/icsharpcode/ilspy-vscode/wiki/Feature-Comparison) for the differences between ILSpy desktop application and the VS Code extension.
 
 ## Requirements
 
-- Visual Studio Code >= 1.101
+- Visual Studio Code >= 1.110
 - .NET 10.0 (installed automatically on first start)
 - Node.js (22 or newer)
 - PNPM
-
-## Development
-
-To debug and run the extension, you first need to build and package the backend:
-
-```
-cd ..
-buildtools/publish-backend
-```
-
-The backend's binaries are automatically copied to `vscode-extension/bin/ilspy-backend`, where the extension expects them.
-
-Then initialize the project with
-
-```
-pnpm install
-```
-
-Open this directory in Visual Studio Code and start debugging with <kbd>F5</kbd>. A development instance of VS Code will open with the latest extension code running.