Adding ThoughtWorks.

Contributor: Tess Zelechowski, tzelecho@thoughtworks.com
Source: internal headcount

I work at ThoughtWorks and I would like to contribute to your google
doc.

In North America, we have 306 developers and 77 of our developers are
women (not including Automated QAs and UI developers).  I could make a
case for including very technical QAs and UI devs though.