add resource for kotlin (#9852)

* add resource for kotlin

* add resource for kotlin list

* re-order resource to fix lint

* fix spaces for lint

* Update free-programming-books-langs.md

Co-authored-by: Eric Hellman <eric@hellman.net>

---------

Co-authored-by: Eric Hellman <eric@hellman.net>

books/free-programming-books-langs.md

@@ -1422,6 +1422,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Kotlin Notes for Professionals](https://goalkicker.com/KotlinBook/) - Compiled from StackOverflow documentation (PDF)
 * [Kotlin Official Documentation](https://kotlinlang.org/docs/reference/)
 * [Kotlin Quick Reference](https://kotlin-quick-reference.com) - Alvin Alexander (gitbook)
+* [Learn Kotlin Programming](https://www.programiz.com/kotlin-programming) - Programiz
 * [Learning Kotlin](https://riptutorial.com/Download/kotlin.pdf) - Compiled from StackOverflow Documentation (PDF)