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update `README` with device example #1467

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Job	Run time
macos-latest: clang++ Release	31m 46s
ubuntu-22.04: /usr/bin/g++-12 Release	31m 38s
macos-latest: clang++ Debug	23m 12s
ubuntu-22.04: /usr/bin/g++-12 Debug	34m 1s
	2h 0m 37s