Add CITING.md #4566

Job	Run time
pre-commit / check-file-sizes	5s
pre-commit / pre-commit	1m 54s
windows / msvc-build (Release)	1m 58s
mac / clang-build (Debug)	3m 7s
ubuntu / gcc-build (ubuntu-24.04, Debug)	2m 7s
mac / clang-build (Release)	2m 28s
ubuntu / gcc-build (ubuntu-24.04, Release)	2m 25s
windows / msvc-build (Debug)	3m 24s
windows / clang-build	2m 28s
ubuntu / clang-build (ubuntu-24.04)	3m 1s
ubuntu / gcc-test (ubuntu-24.04)	33s
windows / clang-test	35s
ubuntu / gcc-test-extended	1s
ubuntu / clang-test	1s
ubuntu / clang-sanitizer-build	1s
ubuntu / clang-sanitizer-test	1s
ubuntu / clang-sanitizer-test-extended	1s
ubuntu / clang-test-extended	1s
ubuntu / gcc-build-codecov	1s
windows / clang-test-extended	1s
mac / clang-test-extended	1s
mac / clang-test	1s
perf	0s
windows / msvc-test-extended	1s
windows / msvc-test	1s
pages	0s
	24m 17s

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