Update README.md

Author: lor6

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

@@ -5,3 +5,5 @@
 - [Cloning an Object in Kotlin](https://www.baeldung.com/kotlin/clone-object)
 - [Assignment in While Expression in Kotlin](https://www.baeldung.com/kotlin/while-variable-assignment)
 - [Breadth-First Search Algorithm in Kotlin](https://www.baeldung.com/kotlin/bfs-graphs)
+- [Calling Private Methods of a Class From Outside the Class](https://www.baeldung.com/kotlin/private-methods-outside-class)
+