updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -216,6 +216,7 @@
  * [IntervalTimer](https://github.com/TheAlgorithms/Javascript/blob/master/Timing-Functions/IntervalTimer.js)
 
 ## Trees
+ * [BreadthFirstTreeTraversal](https://github.com/TheAlgorithms/Javascript/blob/master/Trees/BreadthFirstTreeTraversal.js)
  * [DepthFirstSearch](https://github.com/TheAlgorithms/Javascript/blob/master/Trees/DepthFirstSearch.js)
 
 ## Web-Programming