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update `README` with device example #1483

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Run time

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Job	Run time
macos-latest: clang++ Release	29m 6s
ubuntu-22.04: /usr/bin/g++-12 Release	34m 10s
macos-latest: clang++ Debug	23m 53s
ubuntu-22.04: /usr/bin/g++-12 Debug	35m 9s
	2h 2m 18s