Create free-courses-pt_BR.md (#3177)

* Create free-courses-pt_BR.md

WIP

* Update free-courses-pt_BR.md

* Update free-courses-pt_BR.md

* Update README.md

README.md

@@ -61,6 +61,7 @@ Please read [CONTRIBUTING](/CONTRIBUTING.md). If you're new to Github, [welcome]
 + [German](/free-courses-de.md)
 + [Italian](/free-courses-it.md)
 + [Polish](/free-courses-pl.md)
++ [Portuguese (Brazil)](/free-courses-pt_BR.md)
 + [Russian](/free-courses-ru.md)
 + [Spanish](/free-courses-es.md)
 + [Vietnamese](/free-courses-vi.md)

free-courses-pt_BR.md

+### Index
+
+* [Git](#git)
+
+
+### Git
+
+* [Git e Github para iniciantes](https://www.udemy.com/git-e-github-para-iniciantes/) - Willian Justen de Vasconcellos (Udemy)