Add cinder-specs link to readme.rst
@@ -18,6 +18,7 @@ It has identified itself as `Cinder`. It was abstracted from the Nova project.
* Developer docs: https://docs.openstack.org/cinder/latest/
* Blueprints: https://blueprints.launchpad.net/cinder
* Release notes: https://docs.openstack.org/releasenotes/cinder/
+* Design specifications: https://specs.openstack.org/openstack/cinder-specs/
Getting Started
---------------
