README.md: skopeo on openSUSE
README.md: skopeo on openSUSE

Adds a simple documentation how to install skopeo and its build dependencies
on an openSUSE distribution

Signed-off-by: José Guilherme Vanz <a61adc313a5e0c108ce108b9a2e51dcb7b9472b5@suse.com>

mtrmac/skopeo,mtrmac/skopeo,mtrmac/skopeo