Create npm-scipts.md

[aashimgarg]

Fixes #XX

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Checklist:

• [ ] My pull request has a descriptive title (not a vague title like Update index.md).
• [ ] My pull request targets the master branch of the repository.
• [ ] My commit messages follow best practices.
• [ ] I added tests for the changes I made (if applicable).
• [ ] I added or updated documentation (if applicable).
• [ ] I tried running the project locally and verified that there are no visible errors.