R-CMD-check.yaml

use better example for readme #2

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Job	Run time
ubuntu-latest (oldrel-1)	2m 53s
ubuntu-latest (release)	1m 27s
windows-latest (release)	1m 54s
ubuntu-latest (devel)	1m 31s
macos-latest (release)	2m 1s
ubuntu-latest (oldrel-2)	1m 23s
windows-latest (oldrel-4)	3m 37s
ubuntu-latest (oldrel-4)	2m 36s
ubuntu-latest (oldrel-3)	2m 39s
	20m 1s