adding precommit and sample markdown lint

[gone]

Initial precommit config that changes nothing just to get the ci running

[1cg]

Hi there, can you explain what this does?

[alexpetros]

We have a different CI setup now, and generally speaking, adding a pre-commit hook is a pretty big change to the development process that I'm not sure everyone wants. If you're still interested in it, please open an issue where we can discuss.