Update README.md

Author: rcalago

core-kotlin-modules/core-kotlin-10/README.md

@@ -2,3 +2,4 @@
 - [Determine Operating System in Kotlin](https://www.baeldung.com/kotlin/operating-system-identify)
 - [Kotlin when vs. Java switch Statement](https://www.baeldung.com/kotlin/when-vs-java-switch)
 - [Kotlin AES Encryption and Decryption](https://www.baeldung.com/kotlin/advanced-encryption-standard)
+- [Cloning an Object in Kotlin](https://www.baeldung.com/kotlin/clone-object)