Add a migration notice

README.md

@@ -1,7 +1,17 @@
 # vscode-extension-vscode
-The vscode NPM module provides VS Code extension authors tools to write extensions. It provides the vscode.d.ts node module (all accessible API for extensions) as well as commands for compiling and testing extensions.
+
+## ⚠️ Use @types/vscode and vscode-test instead ⚠️
+
+The funcionality of `vscode` module has been splitted into `@types/vscode` and `vscode-test`. They have fewer dependencies, allow greater flexibility in writing tests and will continue to receive updates. Although `vscode` will continue to work, we suggest that you migrate to `@types/vscode` and `vscode-test`.
+
+[Release Notes](https://code.visualstudio.com/updates/v1_36#_splitting-vscode-package-into-typesvscode-and-vscodetest) | [Migration Guide](https://code.visualstudio.com/api/working-with-extensions/testing-extension#migrating-from-vscode)
+
+---
+
+The `vscode` NPM module provides VS Code extension authors tools to write extensions. It provides the `vscode.d.ts` node module (all accessible API for extensions) as well as commands for compiling and testing extensions.
 
 For more information around extension authoring for VS Code, please see http://code.visualstudio.com/docs/extensions/overview
 
 # License
+
 [MIT](LICENSE)