New contributor guidelines; Add AUTHORS.md

[feross]

give contributors credit!

[yciabaud]

Thank you @feross, my name is duplicated because I switch my git config sometimes.
You can merge it if you want. You can also use my new primary github email: yoann@sonora.io

[feross]

@yciabaud Thanks for letting me know. Removed the duplicate. 👍 As for your new email, I'd prefer to not have to maintain the code to transform emails in the update script. :/

[lock]

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