"First Contribution Guidelines"

An idea we've been kicking around lately is to create a set of guidelines, similar to our existing contribution guidelines, that are paired down quite a bit in order to encourage first time contributors.

These guidelines could exclude a lot of the extra learning we expect long term contributors to do and would be small enough that people new to the project will read it and easily grok it. It could also be linked to by [automation for first time contributors](https://github.com/ipfs/community/issues/369).