Is your feature request related to a problem? Please describe.

I'd like to specify multiple specific directories or files to check, such as all the README.mds in a monorepo and nothing else. Currently I must specify the root directory, then exclude dozens of sub-sub-subdirectories.

Describe the solution you'd like

I'd like an argument that accepts regular expressions and would be used for checking links in specific files. For example:

--files "filepath1/readme.md,filepath2/readme.md,filepath3/readme.md"

Describe alternatives you've considered

https://github.com/tcort/github-action-markdown-link-check but it's slower and doesn't find as many links as mlc.