More extra files

[hturner]

Update CONTRIBUTING.md and add CITATION.cff

[github-actions[bot]]

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:stopwatch: Updated at 2022-04-07 12:43:16 +0000

[hturner]

@all-contributors please add @hturner for projectManagement

[allcontributors[bot]]

@hturner

I've updated the pull request to add @hturner! :tada:

[hturner]

@all-contributors please add @SaranjeetKaur for content

[allcontributors[bot]]

@hturner

I've put up a pull request to add @SaranjeetKaur! :tada: