updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -87,6 +87,9 @@
  * [PrimeCheck](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/PrimeCheck.js)
  * [SieveOfEratosthenes](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/SieveOfEratosthenes.js)
 
+## Project Euler
+ * [Problem1](https://github.com/TheAlgorithms/Javascript/blob/master/Project%20Euler/Problem1.js)
+
 ## Recursive
  * [EucledianGCD](https://github.com/TheAlgorithms/Javascript/blob/master/Recursive/EucledianGCD.js)
  * [TowerOfHanoi](https://github.com/TheAlgorithms/Javascript/blob/master/Recursive/TowerOfHanoi.js)