consider installing goodfirstissue app gvisor repo

Hi,

Thanks for the opensource project `gvisor`.

I had heard about the project while following some folks on twitter and today stumbled upon the repo while searching for projects promoting/using "goodfirstissue" label to encourage first time contributors.

I've developed a github bot [goodfirstissue](https://github.com/rajatjindal/goodfirstissue) which tweets 'good first issues' via twitter handle [@goodfirstissue](https://twitter.com/goodfirstissue).

the targeted audience for twitter account are first time contributors, and to encourage open source contributions.

## Some details:

**Permissions this app need:** read permission on issues and metadata.
**Twitter Handle used to tweet:** [@goodfirstissue](https://twitter.com/goodfirstissue)
**Source code of the app/webhook:** https://github.com/rajatjindal/goodfirstissue
**Instructions to install github app**: https://github.com/rajatjindal/goodfirstissue#how-to-install
**Current Users**: https://github.com/rajatjindal/goodfirstissue#current-users

Thank you for considering this app.

Disclaimer: i am the author of goodfirstissue app. I am relatively new to opensource community and looking to engage more in open source contributions myself too.