(#8486) Update README for 0.6.0 rc1 release
(#8486) Update README for 0.6.0 rc1 release

This change updates the README file for the 0.6.0 release.  The goal is
to help the end user get started with cloudpack as quickly as possible.

16nsk/puppetlabs-cloud_provisioner,amos6224/puppetlabs-cloud-provisioner,puppetlabs/puppetlabs-cloud_provisioner,puppetlabs/puppetlabs-cloud_provisioner