add an initial contributor CoC

this is so everybody knows this project is LEGIT and that you--yes
YOU--are welcome to help us build this weird little thing.

<3 to @Bantik for the idea and the draft

calling all collaborators:

@vitorgalvao @passcod @NanoXD @fanquake @leoj3n @rolandwalker @kevinSuttle 

HELLO ALL YOU GOOD PEOPLE, :grinning: 

This is just a doc that asserts the sort of stuff we already do.

Take a looksie and raise any issues you might have.

Maybe you want to know more of why to do this, here is a start:

http://www.ethics.org/resource/why-have-code-conduct