Update README to include vbguest plugin installation
Update README to include vbguest plugin installation

Signed-off-by: Matheus Miranda <6faf3a473c1bf7863f2eb74400dd6142ec07131e@gmail.com>

PlataformaJogosUnB/chef-devenv,PlataformaJogosUnB/chef-devenv,PlataformaJogosUnB/chef-devenv