updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -86,6 +86,8 @@
 
 ## Maths
  * [Abs](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Abs.js)
+ * [Area](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Area.js)
+ * [Area](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Area.test.js)
  * [AverageMean](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/AverageMean.js)
  * [digitSum](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/digitSum.js)
  * [Factorial](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Factorial.js)