doc: add simple description and CI badge to readme #74

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Run time

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Job	Run time
test (1.17.0, 27)	2m 47s
test (1.16.3, 26.1.2)	2m 47s
test (1.15.6, 24.3.4.13)	2m 52s
test (1.11.4, 21.3.8.24)	2m 42s
	11m 8s