message: Add instructions to README how to connect interface to local testnet
diff: @@ -24,3 +24,15 @@ The interface is created using [create-eth-app](https://github.com/PaulRBerg/cre
  - To install, clone this repository, navigate to the net-emissions-token-network/interface directory, and run `yarn install`
  - To run on your local environment, run `yarn react-app:start`
  - To build, run `yarn react-app:build`
  +
  +### Connecting to local testnet
  +
  +Hardhat implements its own Ethereum local testnet called Hardhat Network. In order to connect the interface to this local testnet:
  +
  +1. Install the [MetaMask extension](https://metamask.io/)
  +2. Run the interface in `net-emissions-token-network/interface` with `yarn react-app:start`
  +3. In a separate terminal, run the Hardhat Network in `net-emissions-token-network` with `npx hardhat node`
  +3. Press *Connect* in the interface to connect to your MetaMask wallet
  +4. In the MetaMask extension, change the network from Ethereum Mainnet to *Localhost 8545*
  +
  +You should now be connected to your local testnet and be able to interact with contracts deployed on it.
  