Added the solution for reversing a linked list in CPP

Hackerrank/reverse-a-linked-list.cpp

@@ -0,0 +1,23 @@
+/*approach :
+We create three pointers to traverse the current previous and the next node, and with each current node, we modify its next pointer and update the pointer again*/
+
+
+#include <bits/stdc++.h>
+using namespace std;
+SinglyLinkedListNode* reverse(SinglyLinkedListNode* llist) {
+    if(!llist) return llist;
+
+    SinglyLinkedListNode* prev = nullptr;
+    SinglyLinkedListNode* curr = llist;
+    SinglyLinkedListNode* next = nullptr;
+
+    while(curr){
+        next = curr->next;
+        curr->next = prev;
+
+        prev = curr;
+        curr = next;
+    }
+
+    return prev;
+}

README.md

@@ -102,6 +102,9 @@ In this repository, you can find the solutions (as source code) for the problems
 | [Nauman Chaudhary](https://github.com/nauman-chaudhary) <br> <img src="https://github.com/nauman-chaudhary.png" width="100" height="100">   | Pakistan   | Python |   |
 | [Gourav Rusiya](https://github.com/GouravRusiya30) <br> <img src="https://github.com/GouravRusiya30.png" width="100" height="100">   | India   | Java | https://www.hackerrank.com/gouravrusiya786  |
 | [Trushita Maurya](https://github.com/trushita23) <br> <img src="https://github.com/trushita23.png" width="100" height="100">   | India   | Java 
+
+| [Arjun Chaudhary](https://github.com/Arjun-3105) <br> <img src="https://github.com/Arjun-3105.png" width="100" height="100">   | 
+India |  C++ 
 ### License
 
 [![MIT Licence](https://badges.frapsoft.com/os/mit/mit.svg?v=103)](https://github.com/ows-ali/Hacktoberfest/blob/master/LICENSE)