Add Kotlin Quick Reference online book. (#6103)

* Add Kotlin Quick Reference online book.

https://kotlin-quick-reference.com/

* Update free-programming-books-langs.md

* Update books/free-programming-books-langs.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>

* Update free-programming-books-langs.md

Co-authored-by: David Ordás <3125580+davorpa@users.noreply.github.com>
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Arky 2021-10-11 01:43:45 +05:30 committed by GitHub
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@ -1321,6 +1321,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
* [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)
* [Learning Kotlin](https://riptutorial.com/Download/kotlin.pdf) (PDF)