Update README.md

Author: rcalago

scala-core-collections-modules/scala-core-collections-3/README.md

@@ -9,3 +9,4 @@
 - [Implementing an LRU Cache in Scala 3: A Step-by-Step Guide](https://www.baeldung.com/scala/least-recently-used-cache)
 - [Using the sliding() and grouped() Methods With Scala Collections](https://www.baeldung.com/scala/sliding-grouped-methods-with-collections)
 - [Introduction to BitSet in Scala](https://www.baeldung.com/scala/bitiset)
+- [zip(), zipAll(), and zipWithIndex() Methods in Scala](https://www.baeldung.com/scala/zip-zipall-zipwithindex)