README: Describe how to fetch built images
README: Describe how to fetch built images

Add description of how to fetch built images from inside of a container/vm
started by Vagrant.

Signed-off-by: Viktor Sjölind <de9bdef9475b3a1b942c4473840195297b5e2350@pelagicore.com>

DunderRoffe/pelux-manifests,rpannek/pelux-manifests,sashko/pelux-manifests,Pelagicore/pelux-manifests