Merge pull request #3 from jdaudier/master

Add a few resources
Add pyladies and urbantxt

UrbanTxT is focused on young males in inner cities.  Not sure if you'd the diversity section split for gender and socioeconomic stuff.  FWIW I like them all together for a more diverse list :)
add girlsintech.org
Merge pull request #4 from flores/master

Add pyladies, urbantxt, and girls in tech
Add video link to teaching section