Update README.md (#958)

Author: m30m

target_chains/ethereum/contracts/README.md

@@ -33,6 +33,21 @@ npm run install-forge-deps
 After installing the dependencies. Run `forge build` to build the contracts and `forge test` to
 test the contracts using tests in `forge-test` directory.
 
+### Governance tests
+There is a separate test suite executed by truffle for testing governance messages and contract upgrades. You can either use tilt to test automatically or run ganache-cli as a blockchain instance and test it manually. To do the latter, run the following commands in the `contracts` folder:  
+1. Spawn a new network on a seperate terminal (do not close it while running tests):
+```bash
+npx ganache-cli -e 10000 --deterministic --time="1970-01-02T00:00:00+00:00" --host=0.0.0.0
+```
+2. deploy the contracts:
+```bash
+cp .env.test .env && npx truffle compile --all && npx truffle migrate
+```
+3. Run the test suite:
+```bash
+npm run test-contract
+```
+
 ### Gas Benchmark
 
 You can use foundry to run benchmark tests written in [`forge-test/GasBenchmark.t.sol`](./forge-test/GasBenchmark.t.sol). To run the tests with gas report