[Adding a Binary Tree Problem]

[amanpatel23]

Symmetric Tree | LeetCode | 101

Detailed Description

I want to add a question on Binary Tree, which LeetCode famous problem Symmetric tree. This problem is solved using DFS

Context

Well, I wanted to participate in hacktoberfest and so providing a value to the open source is always a good thing.
They can understand multiple topics like recursion, what is DFS. And also it will encourage them towards problem solving skills.

[kvedala]

To participate in the Hacktoberfest,

1. create a contribution appropriate for this repo
2. Review the repo's aims and objectives and the coding standards. Lot of documentation and samples are provided.
3. Create a pull-request from your fork of this repo. Ensure you follow the checklist thoroughly.

Creating issues does not help in Hacktoberfest.
Thank you