Update README with info about git and java install

Managing the git and java installs are optional. Make note as to what
needs to be installed to take advantage of it.

Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>
Finish up the basic installation bits

This should be the completion of the most basic of the installation.
Configuration comes next and then we'll need another section for the
initialization

Signed-off-by: Andrew Grimberg <agrimberg@linuxfoundation.org>