Documentation

[eveyonline]

Hello @weaverryan !

I hope you are doing fine ! :sunflower:

We are trying to uniform documentation on our public repositories adding code of conducts and contributing guidelines (you can check Snappy repository as an example CODE_OF_CONDUCT.md and CONTRIBUTING.md).

Do you mind if we create a PR to add them on this repository as well (the contributing guidelines will be more generic than Snappy's ones)?

Have a nice day ! Eve

cc @akovalyov @NicolasNSSM