Publish former wiki page as README.md
Publish former wiki page as README.md

https://wiki.opnfv.org/pages/viewpage.action?pageId=13211751

Change-Id: I3c564bdca64b50b04f353137814ed089ad1b193b
Signed-off-by: Cédric Ollivier <d48310251a4a484d041bc5d09a9ac4d86d20f793@orange.com>

opnfv/functest,opnfv/functest