Adding initial CITATION.cff. #1202

Job	Run time
Check HISTORY RST syntax	11s
Check for syntax errors	20s
Run Workbench Tests (windows-latest)	9m 39s
Run Workbench Tests (macos-latest)	7m 19s
Validate Sampledata & User Guide	8m 10s
Check sdist (3.8, windows-latest)	5m 18s
Run model tests (3.8, windows-latest)	16m 5s
Check sdist (3.8, macos-latest)	1s
Run model tests (3.8, macos-latest)	1s
Check sdist (3.9, windows-latest)	5m 19s
Run model tests (3.9, windows-latest)	16m 5s
Check sdist (3.9, macos-latest)	1s
Run model tests (3.9, macos-latest)	1s
Build binaries (macos-latest)	4m 39s
Check sdist (3.10, windows-latest)	5m 13s
Run model tests (3.10, windows-latest)	15m 31s
Build binaries (windows-latest)	17m 15s
Check sdist (3.10, macos-latest)	1s
Run model tests (3.10, macos-latest)	2m 39s
Check sdist (3.11, windows-latest)	5m 26s
Run model tests (3.11, windows-latest)	13m 36s
Check sdist (3.11, macos-latest)	1s
Run model tests (3.11, macos-latest)	2m 34s
Check sdist (3.12, windows-latest)	5m 20s
Run model tests (3.12, windows-latest)	12m 48s
Build sampledata archives	5m 57s
Check sdist (3.12, macos-latest)	1s
Run model tests (3.12, macos-latest)	1s
	2h 39m 32s

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