Add notes for React Native monthly #5

Summary:
A blog post with notes from the second React Native monthly meeting. I've gathered notes after the meeting in this blog post.

No test plan, submitting just a documentation file.

[DOCS] [ENHANCEMENT] [blog/2017-11-06-react-native-monthly-5.md] - Submitting notes from React Native monthly #5.

cc hramos
Closes https://github.com/facebook/react-native/pull/16694

Differential Revision: D6259640

Pulled By: hramos

fbshipit-source-id: 328ab6018300bef91bdc8561ac8cbd64d3d93129