create CITATION.cff

[0xGodspeed]

• [x] Does this PR have a descriptive title that could go in our release notes?
• [ ] Does this PR add any new dependencies?
• [ ] Does this PR modify any existing APIs?
  • [ ] Is the change to the API backwards compatible?
• [ ] Have you built the documentation (reference and/or tutorial) and verified the generated documentation is appropriate?

Reference Issues/PRs

What does this implement/fix? Briefly explain your changes.

fixes #1021. I've created a CITATION.cff file.

Any other comments?

Please look at the file and let me know if I should make any changes

[0xGodspeed]

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