Added the Solution of Maximum level sum of a binary tree - Issue No - #1318#1431

ajay-dhangar merged 2 commits intocodeharborhub:maincodeharborhub/codeharborhub.github.io:mainfrom

Hitesh4278:maximum-level-sum-of-a-binary-treeHitesh4278/codeharborhub.github.io:maximum-level-sum-of-a-binary-treeCopy head branch name to clipboard