added readme for evm-messenger

projects/evm-messenger/README.md

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+# EVM Messenger
+Simple messenger project that sends a "Hello World" message between two EVM chains using Wormhole. 
+
+## Dependencies
+This project uses Foundry to compile and deploy EVM contracts. You can find install instructions at [`https://getfoundry.sh`](http://getfoundry.sh)
+
+The javascript dependencies can be installed via `npm install` in this folder.
+
+You will also need Docker; you can get either [Docker Desktop](https://docs.docker.com/get-docker/) if you're developing on your computer or if you're in a headless vm, install [Docker Engine](https://docs.docker.com/engine/)
+
+## Run Guardiand
+After you have the dependencies installed, we'll need to spin up the EVM chains, deploy the Wormhole contracts to them, then startup a Wormhole Guardian to observe and sign VAAs. We have provided a script to automate this all for you.
+
+Simply run `npm run guardiand` and wait while the Wormhole Guardian builds a docker image. The first time you run this command, it might take a while (up to 550 seconds on a modern laptop!). After the image is built however, it'll be relatively fast to bring it up and down. 
+
+## Test Scripts
+After you have Guardiand running, you can run the basic test with `npm run test`. This will: 
+- Deploy a simple Messenger contract (found in chains/evm/src/Messenger.sol) to each EVM chain
+- Register each contract with the other chain
+- Send a message from each contract
+- Fetch the VAA from the Guardian
+- Submit the VAA to each contract
+- Print out the Message
+
+If everything goes correctly, you should get a printout with the Hello World messages on each chain.