Update README.md

Author: AnghelLeonard

queue/README.md

@@ -13,7 +13,8 @@
 *java.util.Deque ("double ended queue"): add things to either end, and take them from either end*\
 *java.util.Deque is a subiterface of java.utilQueue*
 
-- java.util.ArrayDeque, not thread-safe, [example](https://github.com/AnghelLeonard/Data-Structures/tree/master/queue/QueueViaArrayDeque)
+- java.util.ArrayDeque, **not thread-safe**, [example](https://github.com/AnghelLeonard/Data-Structures/tree/master/queue/QueueViaArrayDeque)
+- java.util.concurrency.ArrayBlockingQueue, **thread-safe**, [example](https://github.com/AnghelLeonard/Java-Data-Structures/tree/master/queue/QueueViaArrayBlockingQueueProducerConsumer)
 - java.util.concurrent.ConcurrentLinkedDeque and java.util.ConcurrentLinkedQueue, thread-safe, [example](https://github.com/AnghelLeonard/Data-Structures/tree/master/queue/QueueViaConcurrentLinkedDeque)
 - java.util.LinkedList, not thread-safe and not efficient, [example](https://github.com/AnghelLeonard/Data-Structures/tree/master/queue/QueueViaLinkedList)