Initial Commit

Summary: Arcanist Configuration.

Initial linter configuration

Test Plan: echo {} | arc call-conduit conduit.ping

Reviewers: SweatyMushroomz, WyldBot

Reviewed By: SweatyMushroomz, WyldBot

Subscribers: SweatyMushroomz, WyldBot

Differential Revision: https://phabricator.wildfyre.net/D228