Added the solution of Maximum Depth of Binary Tree

[MercerFrey]

Pull Request Template

Description

Question is maximum depth of a binary tree. Solution is recursively searching whole tree.

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

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

[MercerFrey]

I dont know why 3rd file conflicts. Im sorry that im adding solutions one by one but im trying accomplish hacktoberfest.