Add SakuraCloud plugin to README.md (#574)
Add SakuraCloud plugin to README.md (#574)

Signed-off-by: Kazumichi Yamamoto <992e830136df35c0f18c07d2f1f456aac4dff67e@gmail.com>
craigyam/infrakit,thebsdbox/infrakit,docker/infrakit,chungers/infrakit,FrenchBen/infrakit,craigyam/infrakit,kaufers/infrakit,chungers/infrakit,FrenchBen/infrakit,kaufers/infrakit,docker/infrakit,FrenchBen/infrakit,thebsdbox/infrakit,thebsdbox/infrakit,kaufers/infrakit,chungers/infrakit,docker/infrakit,craigyam/infrakit