Add Danger JS

Start off with spell checking - use Danger JS

Maybe as a follow up do a plugin for danger that makes sure all contributor additions are accounted for in the markdown.

Code would be similar to:  https://github.com/danger/danger-js/blob/9772aacbb62155a55ee5e6a1e4346ebb9aea0129/dangerfile.ts#L28-L32