Add tutorial link to readme #259

Job	Run time
ensure-embedme	40s
code-quality (hive, stable)	1m 11s
check-score (hive)	1m 33s
ensure-codegen	3m 5s
code-quality (hive, beta)	1m 12s
check-score (hive_flutter)	2m 0s
code-quality (hive_flutter, stable)	1m 26s
check-score (hive_generator)	2m 33s
test-hive (vm, kernel)	58s
code-quality (hive_flutter, beta)	1m 24s
test-hive_flutter (stable)	53s
test-hive (chrome, dart2js)	4m 53s
code-quality (hive_generator, stable)	1m 11s
test-hive_flutter (beta)	54s
test-hive_generator (stable, ubuntu-latest)	5m 18s
test-hive (chrome, dart2wasm)	2m 52s
code-quality (hive_generator, beta)	1m 17s
test-hive_generator (stable, windows-latest)	6m 37s
test-hive_generator (beta, ubuntu-latest)	5m 11s
	45m 8s

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