Added Source code for hello world

[JASKAMAL22]

Have you read the Contributing Guidelines on Pull Requests?

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Description

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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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[JASKAMAL22]

hey @maintainers i added c++ problem. Please check this and let me know