updating DIRECTORY.md

Recursive Bubble sort implementation
TheAlgorithms · Krishnapal4050 · Krishnapal4050 · Krishnapal4050 · Oct 10, 2020 · github-actions
diff --git a/sorting/recursive_bubble_sort.cpp b/sorting/recursive_bubble_sort.cpp
diff --git a/sorting/recursive_bubble_sort.cpp b/sorting/recursive_bubble_sort.cpp
diff --git a/sorting/recursive_bubble_sort.cpp b/sorting/recursive_bubble_sort.cpp
+#include<iostream>
+#include <array> 
+
+void recBubble(std::array<int,10> arr, int n){
diff --git a/DIRECTORY.md b/DIRECTORY.md
@@ -113,7 +113,9 @@
  * [Adaline Learning](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/machine_learning/adaline_learning.cpp)
  * [Kohonen Som Topology](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/machine_learning/kohonen_som_topology.cpp)
  * [Kohonen Som Trace](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/machine_learning/kohonen_som_trace.cpp)
+  * [Neural Network](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/machine_learning/neural_network.cpp)