Suggestion: add a small “learning resources” section to README

Hi Folks.

I had a small documentation-related suggestion and wanted to ask before opening a PR. Would you be open to adding a short “Documentation / learning resources” section to the README?

The idea would be to link a few existing resources (official bspwm docs, Arch Wiki, etc.) that help users understand bspwm concepts beyond configuration examples.

I think it could be useful especially for newer users discovering bspwm through this repo, while keeping the README itself minimal.

If this sounds reasonable, I’d be happy to open a small PR following your preferred style — or drop the idea if it doesn’t fit the project’s scope. Thanks for maintaining the project.