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update `README` with device example #1514

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Run time

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Job	Run time
macos-latest: clang++ Release	15m 45s
ubuntu-22.04: /usr/bin/g++-12 Release	31m 0s
macos-latest: clang++ Debug	15m 57s
ubuntu-22.04: /usr/bin/g++-12 Debug	36m 58s
	1h 39m 40s