docs: potential addition of resources

[tusharnankani]

As mentioned in #2, we don't need to add repetitive content.
It is completely alright if similar repositories like opportunities are linked.

Idea

This will be an open & pinned issue throughout.
Add potential repos/resources here.

And make a PR if you have time. If not, just drop the resources here:
Our contributors will add it for you at once, and react the comment with 🚀 once done :D

[tusharnankani]

Hiring without whiteboards: https://github.com/poteto/hiring-without-whiteboards