Feature: Add man page

[ifrendas]

Could a man page be added?

[muesli]

Of course! Do you want to write one?

[ifrendas]

I'd be open to doing that. Where would you like me to put it in the repository when I am done?

[muesli]

I would simply put it in the main directory, alongside the main.go.

[FilBot3]

Here is a link to generate the reference.

• PR: https://github.com/charmbracelet/glow/pull/271