Update README.md

johnA1331 · web-flow · commit 9d18e690cc41 · 2020-03-18T13:19:55.000+08:00
diff --git a/data-structures/README.md b/data-structures/README.md
@@ -9,3 +9,4 @@ This module contains articles about data structures in Java
 - [Circular Linked List Java Implementation](https://www.baeldung.com/java-circular-linked-list)
 - [How to Print a Binary Tree Diagram](https://www.baeldung.com/java-print-binary-tree-diagram)
 - [Introduction to Big Queue](https://www.baeldung.com/java-big-queue)
+- [Guide to AVL Trees in Java](https://www.baeldung.com/java-avl-trees)
