Add status notice in README of prototype datasets #533

Job	Run time
linux (linux.12xlarge, cpu) / linux-job	3m 35s
linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	9m 3s
macos (macos-12) / macos-job	10m 39s
macos (macos-m1-12) / macos-job	3m 44s
windows (windows.4xlarge, cpu) / windows-job	12m 37s
windows (windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	11m 13s
	50m 51s

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