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update `README` with device example #1463

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Run time

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Job	Run time
macos-latest: clang++ Release	18m 59s
ubuntu-22.04: /usr/bin/g++-12 Release	32m 7s
macos-latest: clang++ Debug	43m 9s
ubuntu-22.04: /usr/bin/g++-12 Debug	35m 33s
	2h 9m 48s