Update `README.md`
Update `README.md`

Provide information on how to setup and update the dotfiles.

wingy3181/dotfiles,AlbertoElias/dotfiles,makabde/dotfiles,makabde/dotfiles,EDiLD/dotfiles,girishramnani/dotfiles,zlot/dotfiles,newtonne/dotfiles,AlbertoElias/dotfiles,stevenirby/dotfiles-1,sophatvathana/dotfiles,mickael83/ubuntu-dotfiles,zlot/dotfiles,girishramnani/dotfiles,wingy3181/dotfiles,christophermoura/dotfiles,mickael83/ubuntu-dotfiles,pbrooks/dotfiles,EDiLD/dotfiles,christophermoura/dotfiles,oddlord/dotfiles,b-boogaard/dotfiles,wingy3181/dotfiles,newtonne/dotfiles,khornberg/dotfiles,codelandev/init-setup