Create 206.cpp

[SouravCodery]

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We have implemented the LeetCode's "206 Reverse Linked List" Problem. The solution is well commented and has been accepted by LeetCode's Judge.

Link to the problem: https://leetcode.com/problems/reverse-linked-list/

:heart: Thank you!

[SouravCodery]

can you solve the conflicts with this file on master? thanks!

Ma'am, The Previous Solution was Iterative while the current one was Recursive. I have kept both the approaches while commenting one of them and have put a comment for people's understanding of the same.