Update VM README
Update VM README

Add more discussion about what this is about, also update the instructions to
account for us including the showup project files for ease of use (supposedly).
marrero984/showoff,kublaj/showoff,nomadicoder/showoff,berkes/showoff,marrero984/showoff,marrero984/showoff,slambert/showoff,kublaj/showoff,berkes/showoff,slambert/showoff,wanix/showoff,kublaj/showoff,binford2k/showoff,puppetlabs/showoff,wanix/showoff,slambert/showoff,nomadicoder/showoff,kublaj/showoff,puppetlabs/showoff,kublaj/showoff,puppetlabs/showoff,nomadicoder/showoff,berkes/showoff,marrero984/showoff,wanix/showoff,slambert/showoff,puppetlabs/showoff,binford2k/showoff,berkes/showoff,berkes/showoff,binford2k/showoff,binford2k/showoff,nomadicoder/showoff