docs: commit guidelines (#542)
docs: commit guidelines (#542)

This document will serve as a more expanded guide on the commit
conventions we are going to be introducing in this project mainly for
the purpose of `CHANGELOG.md` generation.

See: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit
Signed-off-by: Juan Cruz Viotti <8493db2a4f45d66df375afe12f7eba59fe1c8d78@gmail.com>
resin-io/etcher,resin-io/etcher,resin-io/resin-etcher,cedricve/etcher,resin-io/herostratus,resin-io/etcher,cedricve/etcher,resin-io/etcher,resin-io/etcher,cedricve/etcher,resin-io/herostratus,resin-io/resin-etcher