Sum of Root To Leaf Binary Numbers

[123shanawaz]

hey @ayu8 , I want to add this solution in CPP into the Binary Tree folder, please assign this to me and add this under hacktoberfest label

problem link:https://leetcode.com/problems/sum-of-root-to-leaf-binary-numbers/

[ayu8]

Go ahead
Make sure to go through CONTRIBUTING.md once