style: add `.eslintrc` (rules from airbnb code style)
style: add `.eslintrc` (rules from airbnb code style)

mdgriffith/linter,kaeluka/linter,AtomLinter/Linter,AsaAyers/linter,steelbrain/linter,UltCombo/linter,JohnMurga/linter,josa42/Linter,blakeembrey/linter,iam4x/linter,e-jigsaw/Linter,elkeis/linter,levity/linter,Arcanemagus/linter,atom-community/linter,shawninder/linter,DanPurdy/linter