Disambiguate with Netflix and Javascript zuul

There are two other projects named zuul. Let's make sure we disambiguate
so users aren't confused.

Change-Id: I6c459d062970e2abcbb890d626297595d979d324
diff --git a/README.rst b/README.rst
index 52b89df..8d00665 100644
--- a/README.rst
+++ b/README.rst
@@ -10,6 +10,14 @@
 The latest documentation for Zuul v3 is published at:
 https://docs.openstack.org/infra/zuul/feature/zuulv3/
 
+If you are looking for the Edge routing service named Zuul that is
+related to Netflix, it can be found here:
+https://github.com/Netflix/zuul
+
+If you are looking for the Javascript testing tool named Zuul, it
+can be found here:
+https://github.com/defunctzombie/zuul
+
 Contributing
 ------------