add link to stack overflow for questions

Author: miguelgrinberg

README.rst

@@ -11,7 +11,10 @@ Resources
 
 -  `Documentation`_
 -  `PyPI`_
+-  Questions? See the `questions`_ others have asked on Stack Overflow, or `ask`_ your own question.
 
 .. _Socket.IO: https://github.com/socketio/socket.io
 .. _Documentation: http://python-socketio.readthedocs.io/en/latest/
 .. _PyPI: https://pypi.python.org/pypi/python-socketio
+.. _questions: https://stackoverflow.com/questions/tagged/python-socketio
+.. _ask: https://stackoverflow.com/questions/ask?tags=python+python-socketio