added new codeforces cpp question

[tanishagarg1803]

Description

Please include a summary of the change and which issue is fixed. List any dependencies that are required for this change.
Added a new question in codeforces folder
question link: https://codeforces.com/contest/96/problem/A

Type of change

Please delete options that are not relevant.

• [x ] New feature (non-breaking change which adds functionality)

Checklist:

• [x ] My code follows the style guidelines(Clean Code) of this project
• [ x] I have performed a self-review of my own code
• [ x] I have commented my code, particularly in hard-to-understand areas
• [ x] I have created a helpful and easy to understand README.md
• [ x] I have made corresponding changes to the documentation
• [x ] My changes generate no new warnings
• [ x] I have added tests/screenshots(if any) that prove my fix is effective or that my feature works