Pull Request Template

Description

Solves the maximum depth of binary tree problem using a breadth first traversal.

Put check marks:

Have you made changes in README file ?

• [^] Added problem & solution under correct topic.
• [^] Specified Space & Time complexity.
• [^] Specified difficulty level, tag & Note(if any).

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• [^ ] Test A
• [ ^] Test B

Passed the accompanying leetcode tests.

Make sure all below guidelines are followed else PR will get Reject:

• [^] My code follows the style guidelines of this project
• [^] I have performed a self-review of my own code
• [^] I have commented my code so that it is easy to understand
• [^] I have made corresponding changes to the documentation
• [^] My changes generate no new warnings
• [^] Any dependent changes have been merged and published in downstream modules

I can tell this is your first pull request! Thank you I'm so honored. :tada::tada::tada: I'll take a look at it ASAP!