Add CITATION file with CHEP 2024 article (#1529) #1204

Job	Run time
Save job metadata	3s
build-ultralite / ultralite-ubuntu	1m 3s
build-fast / focal-gcc-8	3m 38s
build-ultralite / ultralite-windows	1m 52s
build-fast / jammy-gcc-12	1m 10s
build-fast / windows	2m 16s
doc / dev	40s
build-fast / noble-gcc-14	6m 2s
doc / user	1m 32s
build-fast / noble-gcc-14-c++20	6m 2s
build-fast / focal-clang-10	2m 35s
build-fast / jammy-clang-15	1m 3s
build-fast / noble-clang-18	53s
build-fast / noble-clang-18-c++20	53s
all-prechecks	1s
build-spack	1s
build-docker	1s
all	2s
	29m 47s

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