Updated README.md

Asjad-J · web-flow · commit c6706b347765 · 2022-08-10T09:14:15.000+05:00
added link back to the article: https://www.baeldung.com/java-volatile-vs-atomic
diff --git a/core-java-modules/core-java-concurrency-advanced-4/README.md b/core-java-modules/core-java-concurrency-advanced-4/README.md
@@ -7,3 +7,4 @@
 - [Producer-Consumer Problem With Example in Java](https://www.baeldung.com/java-producer-consumer-problem)
 - [Acquire a Lock by a Key in Java](https://www.baeldung.com/java-acquire-lock-by-key)
 - [Differences Between set() and lazySet() in Java Atomic Variables](https://www.baeldung.com/java-atomic-set-vs-lazyset)
+- [Volatile vs. Atomic Variables in Java](https://www.baeldung.com/java-volatile-vs-atomic)
