[NEW] - Add gitpod config

[Rodriq]

this commit adds support for Gitpod.io, a free automated
dev environment that makes contributing and generally working on GitHub
projects much easier. It allows anyone to start a ready-to-code dev
environment for any branch, issue and pull request with a single click.

In relation with #16087

[nisarhassan12]

Thanks! @Rodriq for making a PR for this. Your config does not seem to be working Pease use this instead corneliusludmann@8577c92

[nisarhassan12]

Once this Pr is merged then for anyone with a single click Gitpod will launch a workspace and automatically:

• clone the Rocket.Chat repo.
• install meteor.
• run meteor npm install.
• run meteor npm start.

You can give it a try via this link:

https://gitpod.io/#https://github.com/corneliusludmann/Rocket.Chat/tree/corneliusludmann/gitpod-setup

This is how it looks:

A lot of popular OSS projects out there are already using it simplify contributors onboarding some of them are:

• https://github.com/freeCodeCamp/freeCodeCamp
• https://github.com/facebook/docusaurus
• https://github.com/mozilla/pdf.js/

You can find a brief list of them at https://contribute.dev

[CLAassistant]

All committers have signed the CLA.

[dougfabris]

Hi there, thanks for the contribution! 🚀

Closing this PR because it's duplicated now and it has been fixed in another one. #30921

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