Packager: Start README file with info about the ISO
Packager: Start README file with info about the ISO

Change-Id: If28e530c9159706821fbccea62360be7f24b1f13

wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant