Adding You Don't Know JS in potuguese. (#3627)

* You Don't Know JS in potuguese.

You Don't Know JS in potuguese.

* Update free-programming-books-pt_BR.md

free-programming-books-pt_BR.md

@@ -133,6 +133,12 @@
 * [Guia JavaScript](https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Guide)
 * [Guia Rápido de Desenvolvimento para Firefox OS](https://leanpub.com/guiarapidofirefoxos)
 * [JS: A forma certa](http://jstherightway.org/pt-br/)
+* [You Don't Know JS: Async & Performance](https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/async%20&%20performance/README.md)
+* [You Don't Know JS: ES6 & Além](https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/es6%20&%20beyond/README.md)
+* [You Don't Know JS: Escopos & Closures](https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/scope%20&%20closures/README.md)
+* [You Don't Know JS: Iniciando](https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/up%20&%20going/README.md)
+* [You Don't Know JS: this & Prototipagem de Objetos](https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/this%20&%20object%20prototypes/README.md)
+* [You Don't Know JS: Tipos & Gramática](https://github.com/cezaraugusto/You-Dont-Know-JS/blob/portuguese-translation/types%20&%20grammar/README.md)
 
 
 #### Angular