I have added the bubble sort code in the c++ folder

[Shreyg-27]

Can you please merge it under c++ folder

Have you read the Contributing Guidelines ?

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Description

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Fixes #issue_no

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

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[Sulagna-Dutta-Roy]

Please open a Issue first. And add this Issue no in the PR Template

[Sulagna-Dutta-Roy]

Also I'm accepting only documentations for reading purpose. It's better to close this PR.