Change README instructions to run all samples from root dir (#213) #802

Job	Run time
build-lint-test (3.12, macos-intel)	1m 21s
build-lint-test (3.9, macos-arm)	1m 18s
build-lint-test (3.12, windows-latest)	1m 18s
build-lint-test (3.9, macos-intel)	1m 19s
build-lint-test (3.9, windows-latest)	1m 19s
build-lint-test (3.12, ubuntu-latest)	1m 8s
build-lint-test (3.12, macos-arm)	1m 17s
build-lint-test (3.9, ubuntu-latest)	1m 22s
	10m 22s

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