[Vagrant-Vsphere issue #79 had some helpful instructions for setting up the Vagrantfile](https://github.com/nsidc/vagrant-vsphere/issues/79). The information was helpful so wrote it up and added it to the official README docs.
added inline screenshot
added inline screenshot
Fix typo and bad vagrant command options.

These fixes address my comment on [GH-109].
Merge branch 'DevoKun-master'