Update the README based on meeting notes
Update the README based on meeting notes

Change-Id: Icfc21a79e0f4224568bf10e508fa8867a1b251eb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/140365
Commit-Queue: Janice Collins <f6a8c838e29d3fa8813240c8bed106e760081e0e@google.com>
Reviewed-by: Paul Berry <72d414e3a99fb120308437779d51667bcc0984eb@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk