Update README.md

Author: rcalago

core-kotlin-modules/core-kotlin-collections-list-2/README.md

@@ -3,3 +3,4 @@
 - [Iterate Through a List and Add Items in Kotlin](https://www.baeldung.com/kotlin/list-iterate-add-items-dynamically)
 - [How to Convert a Type-Erased List to an Array in Kotlin](https://www.baeldung.com/kotlin/type-erased-list-array-conversion)
 - [How to Remove Null and Empty Values from a List in Kotlin](https://www.baeldung.com/kotlin/lists-remove-null-empty-values)
+- [How to Initialize a List of Lists in Kotlin](https://www.baeldung.com/kotlin/list-of-lists)