Update README.md

sheryllresulta · web-flow · commit 29602cfa890a · 2019-04-10T14:22:20.000+08:00
diff --git a/core-groovy/README.md b/core-groovy/README.md
@@ -11,3 +11,4 @@
 - [Lists in Groovy](https://www.baeldung.com/groovy-lists)
 - [Converting a String to a Date in Groovy](https://www.baeldung.com/groovy-string-to-date)
 - [Guide to I/O in Groovy](https://www.baeldung.com/groovy-io)
+- [Finding Elements in Collections in Groovy](https://www.baeldung.com/groovy-collections-find-elements)
