updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -386,6 +386,7 @@
   * [Zellers Congruence](https://github.com/TheAlgorithms/Python/blob/master/maths/zellers_congruence.py)
 
 ## Matrix
+  * [Count Islands In Matrix](https://github.com/TheAlgorithms/Python/blob/master/matrix/count_islands_in_matrix.py)
   * [Matrix Class](https://github.com/TheAlgorithms/Python/blob/master/matrix/matrix_class.py)
   * [Matrix Operation](https://github.com/TheAlgorithms/Python/blob/master/matrix/matrix_operation.py)
   * [Nth Fibonacci Using Matrix Exponentiation](https://github.com/TheAlgorithms/Python/blob/master/matrix/nth_fibonacci_using_matrix_exponentiation.py)