Take some cues from Neutron

[tdmalone]

https://github.com/Automattic/phpcs-neutron-standard/
fyi: Automattic/phpcs-neutron-standard#9

• Add a directory above the Sniffs directory so we can have a standard name which is not the name of the package (eg. <rule ref="Chromatix"/>)
• Set the type field of composer.json to phpcodesniffer-standard so that it can be used without having to run the phpcs --config-set installed_paths stuff.
• Consider whether we should adopt any of the other rules and sniffs Neutron are using
• Look at adding some tests, see how Neutron are doing it