Create DNF.cpp

[Md-Aurangzeb]

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• [x] Tested Changes.
• [x] Stakeholder Approval.
• [x] My pull request has a descriptive title (not a vague title like "Update index.md").
• [x] My pull request targets the master branch of the repository.
• [x] My code follows the established code style of the repository.
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[soham4abc]

Hello @Md-Aurangzeb, Thanks for your PR. Can you add a related .md file explaining what your code does??

[soham4abc]

LGTM!