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Added Protocol conformance section to README #1593

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Run time

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Job	Run time
build (ubuntu-latest, 11)	2m 54s
build (ubuntu-latest, 17)	2m 45s
build (ubuntu-latest, 21)	2m 35s
build (macos-latest, 11)	2m 11s
build (macos-latest, 17)	2m 14s
build (macos-latest, 21)	1m 58s
build (8, ubuntu-latest)	2m 29s
	17m 6s