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update `README` with device example #1487

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Run time

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Job	Run time
macos-latest: clang++ Release	50m 41s
ubuntu-22.04: /usr/bin/g++-12 Release	31m 4s
macos-latest: clang++ Debug	49m 1s
ubuntu-22.04: /usr/bin/g++-12 Debug	26m 49s
	2h 37m 35s