Add Ways to reach the nth stair / WoC

[ghost]

Have you read the Contributing Guidelines on Pull Requests?

Yes

Description

(Write your answer here.)
Added Ways to reach the nth stair in C++

Checklist

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

Related Issues or Pull Requests

(Write your answer here.)

[aeyshubh]

This issue is already solved in issue #1455

[HarshCasper]

Hello @KavirajSinghBhati

Thanks for making this Issue!

Unfortunately, as @ShubhamPatel33 mentioned, the Issue is already referenced in an existing Issue. Kindly take a look at the existing issues before you make a new one.

Thanks for taking this up!