Add Raspberry Pi course (#6221)

courses/free-courses-pt_BR.md

@@ -29,6 +29,7 @@
 * [Node.js](#nodejs)
 * [PHP](#php)
 * [Python](#python)
+* [Raspberry Pi](#raspberry-pi)
 * [React Native](#react-native)
 * [Ruby](#ruby)
 * [Sass](#sass)
@@ -267,6 +268,11 @@
 * [Selenium com Python](https://www.youtube.com/playlist?list=PLOQgLBuj2-3LqnMYKZZgzeC7CKCPF375B) - Eduardo Mendes (YouTube)
 
 
+### Raspberry Pi
+
+* [Curso de Raspberry Pi: primeiros passos](https://www.youtube.com/playlist?list=PLHz_AreHm4dnGZ_nudmN4rvyLk2fHFRzy) - Gustavo Guanabara (YouTube)
+
+
 ### React Native
 
 * [Aprenda React Native](https://www.youtube.com/playlist?list=PL8fIRnD1uUSnRqz3E2caAWDqbtIFXmNtW) - Canal Geek Dev (YouTube)