Update README.md

Author: rcalago

core-kotlin-modules/core-kotlin-collections-set/README.md

@@ -2,3 +2,4 @@
 - [Guide to Set and MutableSet in Kotlin](https://www.baeldung.com/kotlin/set-mutableset)
 - [Clone a Set in Kotlin](https://www.baeldung.com/kotlin/clone-set)
 - [How to Add List Contents Into a Set in Kotlin](https://www.baeldung.com/kotlin/set-add-list-elements)
+- [Convert Array to Set and Vice-Versa in Kotlin](https://www.baeldung.com/kotlin/array-set-conversion)