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/e98335594e6d21bc76edbb62f3846f06

Change-Id: I6db6e40f8fee94bddbf6f9212c82b62d0df022de

README.md

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