Article on NQueens problem

[gayatri517]

Have you read the Contributing Guidelines on Pull Requests?

Yes

Description

Both codes in python and C++ are written by me

Checklist

• [x] I've read the contribution guidelines.
• [x] I've checked the issue list before deciding what to submit.
• [x] I've edited the README.md and link to my code.

Related Issues or Pull Requests

Fixes #550

[gayatri517]

@ankitaggarwal23 Why has this PR been closed?