Update the README of Data Connect to help developers onboarding #9733

Job	Run time
Check changed files	0s
pod-lib-lint-abtesting (iOS)	8m 49s
pod-lib-lint-auth (iOS)	9m 28s
pod-lib-lint-database (iOS)	12m 11s
pod-lib-lint-dynamiclinks (iOS)	6m 45s
pod-lib-lint-firestore (iOS)	32m 9s
pod-lib-lint-functions (iOS)	3m 13s
pod-lib-lint-inappmessaging (iOS)	7m 58s
pod-lib-lint-messaging (iOS)	9m 38s
pod-lib-lint-remoteconfig (iOS)	10m 20s
pod-lib-lint-performance (iOS)	8m 26s
pod-lib-lint-storage (iOS)	7m 31s
create_report	37s
	1h 57m 5s

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