Add appropriate links into README.rst
Add appropriate links into README.rst

The oslo repositories are standardizing on a common
set of links to include in README.rst (which the
release note script will also use); so therefore we
should add our own set to match those other projects.

Change-Id: I58cbcd9b36fd0432b59e9eec3ad5ab54a1fede3a

jimbobhickville/taskflow,jimbobhickville/taskflow,openstack/taskflow,pombredanne/taskflow-1,openstack/taskflow,pombredanne/taskflow-1,junneyang/taskflow,junneyang/taskflow