Add course Kotlin Basics free ptBR (#8932)

* adiciona curso kotlin basico e gratuito

* resolve problema com o lint

* Update courses/free-courses-pt_BR.md

Co-authored-by: Sharan J <50091666+shrn01@users.noreply.github.com>

Co-authored-by: Eric Hellman <eric@hellman.net>
Co-authored-by: Sharan J <50091666+shrn01@users.noreply.github.com>

courses/free-courses-pt_BR.md

@@ -223,6 +223,7 @@
 ### Kotlin
 
 * [Aprenda Kotlin do zero - Módulo Básico](https://www.udemy.com/kotlin-aprenda-do-zero-modulo-basico/) - Pedro Massango (Udemy)
+* [Curso de Kotlin - Básico](https://www.youtube.com/playlist?list=PLlGFv5gh9fBIJ8SEaQ_AKon-uenAlUbjE) - Rapadura Dev
 * [Curso de Kotlin 2020 \| Básico](https://www.youtube.com/playlist?list=PLPs3nlHFeKTr-aDDvUxU971rPSVTyQ6Bn) - Douglas Motta (YouTube)
 * [Curso de Kotlin 2021](https://www.youtube.com/playlist?list=PL9dOBCBB2d-hhioxKoL6ODVILWcWuas8b) - Devaria (YouTube)
 * [Desenvolvedor Kotlin Iniciante](https://www.udemy.com/desenvolvedor-kotlin-iniciante/) - Gabriel Ferrari, Adriano Sacardo (Udemy)