Show team and repo badges on README

This patch adds the team's and repository's badges to the README file.
The motivation behind this is to communicate the project status and
features at first glance.

For more information about this effort, please read this email thread:

http://lists.openstack.org/pipermail/openstack-dev/2016-October/105562.html

To see an example of how this would look like check:

https://gist.github.com/18d5632a3c90c98fefe80ce25ec8c85b

Change-Id: Ic7ce2bc5c78e5c0115ac34f794128df74c919a16

README.md

@@ -1,3 +1,10 @@
+Team and repository tags
+========================
+
+[![Team and repository tags](http://governance.openstack.org/badges/puppet-oslo.svg)](http://governance.openstack.org/reference/tags/index.html)
+
+<!-- Change things from this point on -->
+
 oslo
 =======