Snippets: File definition is added

[Moralescr]

Changes

File Definition Statement is added.

Checklist

• [ ] have tested my change
• [ ] updated relevant documentation
• [ ] Remove any/all console.logs I added
• [ ] eslint is not complaining
• [x] have added myself to the contributors' list in the README
• [ ] for feature PRs: PR only includes one feature enhancement.

[chrjorgensen]

@Moralescr Thank you for contributing and catching this serious omission! 👍