docs: add vscode-open-in-npmx to the readme (#1448)

Author: sybers

README.md

@@ -155,7 +155,8 @@ We welcome contributions – please do feel free to explore the project and
 - [npm-userscript](https://github.com/bluwy/npm-userscript) – Browser userscript with various improvements and fixes for npmjs.com
 - [npm-alt](https://npm.willow.sh/) – An alternative npm package browser
 - [npkg.lorypelli.dev](https://npkg.lorypelli.dev/) – An alternative frontend to npm made with as little client-side JavaScript as possible
-- [vscode-npmx](https://github.com/npmx-dev/vscode-npmx) – VSCode extension for npmx
+- [vscode-npmx](https://github.com/npmx-dev/vscode-npmx) – Official VSCode extension for npmx
+- [vscode-open-in-npmx](https://github.com/sybers/vscode-open-in-npmx) – VSCode shortcut to open packages on npmx
 - [nxjt](https://nxjt.netlify.app) – npmx Jump To: Quickly navigate to npmx common webpages.
 - [npmx-weekly](https://npmx-weekly.trueberryless.org/) – A weekly newsletter for the npmx ecosystem. Add your own content via suggestions in the weekly PR on [GitHub](https://github.com/trueberryless-org/npmx-weekly/pulls?q=is%3Aopen+is%3Apr+label%3A%22%F0%9F%95%94+weekly+post%22).
 - [npmx-digest](https://npmx-digest.trueberryless.org/) – An automated news aggregation website that summarizes npmx activity from GitHub and Bluesky every 8 hours.