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Update readmes for all clients - move common things to one place. #49

Job	Run time
build-amazonlinux-latest	0s
build-and-test-go-client (1.18, 6.2.14, ubuntu-latest)	3m 4s
lint-rust	1m 34s
build-and-test-go-client (1.18, 6.2.14, macos-latest)	11m 46s
build-and-test-go-client (1.18, 7.2.3, ubuntu-latest)	2m 49s
build-and-test-go-client (1.18, 7.2.3, macos-latest)	7m 36s
build-and-test-go-client (1.21, 6.2.14, ubuntu-latest)	2m 56s
build-and-test-go-client (1.21, 6.2.14, macos-latest)	3m 43s
build-and-test-go-client (1.21, 7.2.3, ubuntu-latest)	3m 10s
build-and-test-go-client (1.21, 7.2.3, macos-latest)	4m 55s
	41m 33s

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