question: possibility of ignoring directories and files with globbing

Hello everybody :)
First off thank you very much for your work 👍

Maybe it's just me, but i don't seem to be able to ignore the `node_modules`-folder, how would a command: "_lint all `.md`-files but ignore `node_modules`_" look like, if it is possible in the first place?

Start by examining the CLI's handling of file globs, using the requested case of linting `.md` files while excluding `node_modules`. Determine whether ignore patterns are already supported and identify the relevant documentation or command behavior to update; done means users have a clear, working way to express this exclusion.

Written by the indexing model from the issue text.