Translation to Portuguese (pt-br)

Hello to everyone, 

Firstly I would to congratulate by this idea. It's really important contribute with the community about how to expand our knowledge.
I'm a brazilian front-end developer that decided to contribute with this document, translating to my native language. I forked this repo at last week, perhaps some informations can be disregarded because can be obsolete, like an old layout (I saw some differences between my version and actual, but I still decided to continue).
I hope this may help to grow up and comes to more popular yet.

A hug! \o