add Codecov test-coverage.yml and add badge to README (#305) #497

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Job	Run time
macOS-latest (release)	2m 9s
windows-latest (release)	4m 0s
ubuntu-latest (devel)	2m 33s
ubuntu-latest (release)	2m 7s
ubuntu-latest (oldrel-1)	2m 8s
	12m 57s