updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -89,23 +89,36 @@
  * [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)
+ * [ArmstrongNumber](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/ArmstrongNumber.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)
+ * [Factors](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Factors.js)
  * [Fibonacci](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Fibonacci.js)
  * [FindHcf](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/FindHcf.js)
  * [FindLcm](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/FindLcm.js)
  * [GridGet](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/GridGet.js)
  * [isDivisible](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/isDivisible.js)
  * [MeanSquareError](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/MeanSquareError.js)
  * [ModularBinaryExponentiationRecursive](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/ModularBinaryExponentiationRecursive.js)
+ * [NumberOfDigits](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/NumberOfDigits.js)
  * [Palindrome](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Palindrome.js)
  * [PascalTriangle](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/PascalTriangle.js)
+ * [PerfectCube](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/PerfectCube.js)
+ * [PerfectNumber](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/PerfectNumber.js)
+ * [PerfectSquare](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/PerfectSquare.js)
  * [PiApproximationMonteCarlo](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/PiApproximationMonteCarlo.js)
  * [Polynomial](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Polynomial.js)
  * [PrimeCheck](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/PrimeCheck.js)
  * [ReversePolishNotation](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/ReversePolishNotation.js)
  * [SieveOfEratosthenes](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/SieveOfEratosthenes.js)
+ * test
+ * [ArmstrongNumber](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/ArmstrongNumber.test.js)
+ * [Factors](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Factors.test.js)
+ * [NumberOfDigits](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/NumberOfDigits.test.js)
+ * [PerfectCube](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PerfectCube.test.js)
+ * [PerfectNumber](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PerfectNumber.test.js)
+ * [PerfectSquare](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PerfectSquare.test.js)
 
 ## Project-Euler
  * [Problem1](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem1.js)