Add draft A1 Mediator API client and config
Use nexus3.o-ran-sc.org (not nexus.oranosc.org)
Use CONTAINER_PUSH_REGISTRY in the pom (not bogus NEXUS3_PUSH..)
Change-Id: Ib96aa2c8eef761ffbcbcecf69f3ab34f10bc3cd7 Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>