Externalise config per-project basis #10

Accepted types and other preferences could be set on a global, or probably better, per-project basis in some config file.

existing proj for reference: https://github.com/conventional-changelog/commitlint/tree/master/%40commitlint/config-conventional

• Possibly include ability to modify template?
• There could be an interactive tool to generate/modify these templating/settings files from the CL.