doc(bridge-ethereum): truffle migration

bridges/ethereum/README.md

@@ -8,4 +8,20 @@ The sender that wish to wrap ETH or ERC20 in Bitgreen Chain, should deposit the
 
 All the other functions are accessible to the "Keepers" of the bridge.
 
+## Truffle setup
 
+Refer to truffle oficial documentation at https://trufflesuite.com/docs/truffle/getting-started/running-migrations/
+
+### Custom parameters for bitgreen
+
+* Run yarn to bring dependencies
+* Set your environment variable YOUR_SEED_PHRASE to contract owner mnemonic phrase
+* Select network when running migration based on configuration from truffle-config.js 
+
+Example:
+```
+yarn
+export YOUR_SEED_PHRASE="affair leopard fever palace ..."
+truffle migrate --network rinkeby_local
+
+```

bridges/ethereum/truffle-config.js

@@ -29,6 +29,14 @@ module.exports = {
     confirmations: 2,    // # of confs to wait between deployments. (default: 0)
     timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
     skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
+  },
+  goerli_local: {
+    provider: () => new HDWalletProvider(YOUR_SEED_PHRASE, `http://127.0.0.1:8545`),
+    network_id: 5,       // Ropsten's id
+    gas: 5500000,        // Ropsten has a lower block limit than mainnet
+    confirmations: 1,    // # of confs to wait between deployments. (default: 0)
+    timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
+    skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
   }
   },
   //