add badges to README #8

Job	Run time
build-and-test (ubuntu-latest, Release)	8s
build-and-test (ubuntu-latest, Debug)	6s
build-and-test (windows-latest, Release)	53s
build-and-test (macos-latest, Release)	8s
build-and-test (macos-latest, Debug)	10s
build-and-test (windows-latest, Debug)	32s
	1m 57s

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