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Update READMEs for archiving (#7210)

Adds notes to README and CONTRIBUTING pointing to flutter/packages.
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stuartmorgan committed
557d3284ac9dda32a1106bb75be8a23bdccd2f96
Parent: 34a6813
Committed by GitHub <noreply@github.com> on 2/22/2023, 12:22:16 AM