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

lazygit is a terminal-based user interface.
Users of Linux distributions often rely on offline manual pages (man), but no official manpage currently exists for lazygit.

Describe the solution you'd like

Add and maintain an official manpage within the lazygit project.

Describe alternatives you've considered

lazygit already provides well-written and well-maintained web documentation:

• https://github.com/jesseduffield/lazygit/blob/master/README.md
• https://github.com/jesseduffield/lazygit/blob/master/docs/README.md

These documents are also included in the Debian package:

• https://packages.debian.org/sid/amd64/lazygit/filelist

However, they are not formatted for traditional command-line manual page interfaces.