Update README for standalone-activity sample #1435

Job	Run time
build-lint-test (3.10, windows-latest)	7m 11s
build-lint-test (3.14, ubuntu-latest)	7m 17s
build-lint-test (3.14, macos-arm)	6m 33s
build-lint-test (3.10, macos-arm)	9m 53s
build-lint-test (3.10, ubuntu-latest)	6m 41s
build-lint-test (3.14, macos-intel)	9m 41s
build-lint-test (3.10, macos-intel)	13m 34s
build-lint-test (3.14, windows-latest)	8m 15s
	1h 9m 5s

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