Add CITATION.cff #111

Job	Run time
build-wheels (ubuntu-22.04, cp39, x86_64)	8m 53s
build-wheels (ubuntu-22.04, cp310, x86_64)	9m 17s
build-wheels (ubuntu-22.04, cp311, x86_64)	5m 50s
build-wheels (ubuntu-22.04, cp312, x86_64)	5m 23s
build-wheels (macos-12, cp39, x86_64)	8m 42s
build-wheels (macos-12, cp310, x86_64)	12m 33s
build-wheels (macos-12, cp311, x86_64)	6m 43s
build-wheels (macos-12, cp312, x86_64)	11m 18s
build-wheels (windows-latest, cp39, amd64)	8m 20s
build-wheels (windows-latest, cp310, amd64)	9m 16s
build-wheels (windows-latest, cp311, amd64)	9m 2s
build-wheels (windows-latest, cp312, amd64)	8m 58s
	1h 44m 15s

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