chore: archive repo — development moved to AztecProtocol/aztec-packages

Author: ludamad

README.md

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+# Barretenberg
+
+> **This repository is archived.** Barretenberg is developed as part of the [aztec-packages](https://github.com/AztecProtocol/aztec-packages/tree/master/barretenberg) monorepo.
+
+All development, issues, and pull requests should go to **[AztecProtocol/aztec-packages](https://github.com/AztecProtocol/aztec-packages)**.