Add initial contributor guidelines, borrowing from https://github.com/theodi/gds-api-adapters/blob/master/CONTRIBUTING.md
Add initial contributor guidelines, borrowing from https://github.com/theodi/gds-api-adapters/blob/master/CONTRIBUTING.md

BathHacked/energy-sparks,BathHacked/energy-sparks,BathHacked/energy-sparks,BathHacked/energy-sparks