Add CITATION.cff file

[ethanrd]

See issue #127 for discussion of these changes.

Release checklist

• [ ] Update to use CF DOI once it is created.
• [N/A] Authors updated in cf-conventions.adoc? Add in two places: on line 3 and under .Additional Authors in About the authors.
• [N/A] Next version in cf-conventions.adoc up to date? Versioning inspired by SemVer.
• [N/A] history.adoc up to date?
• [N/A] Conformance document up to date?

[ethanrd]

I have tested this on a personal test repo (testCitation) if anyone wants to see what it looks like. See the "Cite this repository" pull down on right side of main repo page.

I kept it very minimal to not duplicate too much information. The CFF spec allows for lots of other information but I didn't find much that showed up in the automated citation output. I only added the first few authors. I didn't find an "et al" kind of feature so added "the CF Community" as the final author.

Here's the resulting citation in APA

Eaton, B., Gregory, J., Drach, B., Taylor, K., Hankin, S., & CF Community. NetCDF Climate and Forecast (CF) Metadata Conventions. https://doi.org/10.0000/00000

and in BibTeX

@misc{Eaton_NetCDF_Climate_and, author = {Eaton, Brian and Gregory, Jonathan and Drach, Bob and Taylor, Karl and Hankin, Steve and {CF Community}}, doi = {10.0000/00000}, title = {{NetCDF Climate and Forecast (CF) Metadata Conventions}}, url = {https://cfconventions.org} }

[ethanrd]

Waiting for CF DOI to be created before updating the CITATION.cff file and changing this PR from "Draft" to "Ready to review".

[cofinoa]

@ethanrd I'm closing this PR in favour of #570