Update README with command to deploy the new address registry (#30)

* Update README with command to deploy the new address registry

* Update

* Make the command interactive

README.md

@@ -1,5 +1,14 @@
 # Arbitrum Governor Upgrade
 
+## New Address Registry Contract
+
+After the upgrade, a new address registry contract can be deployed by running the following command in the [Arbitrum Governance](https://github.com/ArbitrumFoundation/governance) repo:
+
+```bash
+make
+forge create src/gov-action-contracts/address-registries/L2AddressRegistry.sol:L2AddressRegistry --constructor-args <NEW_CORE_GOVERNOR_CONTRACT_ADDRESS> <NEW_TREASURY_GOVERNOR_CONTRACT_ADDRESS> 0xF3FC178157fb3c87548bAA86F9d24BA38E649B58 0x1D62fFeB72e4c360CcBbacf7c965153b00260417 --rpc-url https://arbitrum.llamarpc.com --interactive
+```
+
 ## License
 
 The code in this repository is licensed under the [GNU Affero General Public License](LICENSE) unless otherwise indicated.