R-CMD-check.yaml

Update `REAMDE.md` and add old unit tests #8

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Job	Run time
macos-latest (release)	2m 6s
windows-latest (release)	3m 46s
ubuntu-latest (devel)	2m 3s
ubuntu-latest (release)	2m 35s
ubuntu-latest (oldrel-1)	1m 51s
	12m 21s