Create index file for dynamically generated docs. (#702)

diff --git a/docs/README.md b/docs/README.md
index 9157aad..0bdda21 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -15,6 +15,8 @@
 
 Learn how to use the Google API Python Client with these guides:
 
+### Usage Guides
+
 - [Getting Started](start.md)
 - [Auth](auth.md)
   - [API Keys](api-keys.md)
@@ -32,4 +34,8 @@
   - [Understand Thread Safety](thread_safety.md)
   - [Use Google App Engine](google_app_engine.md)
   - [Use Django](django.md)
-  
\ No newline at end of file
+
+### Reference Documentation
+
+- Reference documentation for the the core library [googleapiclient](http://googleapis.github.io/google-api-python-client/docs/epy/index.html).
+- [Library reference documentation by API](dyn/index.md).