add tip README.md

[bjoernp116]

Found this quick tip i think can be useful for changing the sudo-rs keyword to sudo. Made it easier for me to switch, without changing my habit.

[squell]

This is somewhat related to the discussion #1182.

Some extra text might be needed to alert users to the unstylish naming used in the current packages (although the text further down does give some tips for how to get the sudo command on Debian: by modifying the PATH).

The problem with the alias solution (which I feel hesistant to endorse it) is of course that aliases aren't inherited by subsequent programs/shells. So any bash script you run that calls sudo still uses ogsudo even if you use this trick. The tip given for Debian users works better for those users. But of course that one doesn't work for Arch/Fedora packages.