Terraform README (#13)

### TL;DR
Added comprehensive documentation for deploying XMTPD nodes using Terraform on AWS.

### What changed?
- Added detailed setup instructions for deploying XMTPD nodes
- Included pre-requisite requirements for AWS and Alchemy accounts
- Documented domain registration process in Route53
- Added configuration instructions for both Terraform Cloud and local deployment
- Provided contract addresses and RPC URL configuration examples

### How to test?
1. Follow the pre-requisite checklist to ensure all accounts and credentials are set up
2. Register a domain in Route53
3. Configure terraform variables either through Terraform Cloud or locally
4. Run `terraform init` and `terraform apply` to verify deployment

### Why make this change?
To provide clear, step-by-step instructions for users wanting to deploy XMTPD nodes on AWS infrastructure, making the deployment process more accessible and reducing potential setup errors.

terraform/README.md

@@ -1 +1,99 @@
-# TODO
+# XMTPD Terraform Modules
+
+**⚠️ Experimental:** This software is in early development. Expect frequent changes and unresolved issues.
+
+`xmtpd` (XMTP daemon) is an experimental version of XMTP node software. It is **not** the node software that currently forms the XMTP network.
+
+This repository includes Terraform modules that can be used as part of a new or existing Terraform plan to add `xmtpd` nodes to your infrastructure.
+
+Currently only AWS is supported with plans for future support for Google Cloud and other hosting providers.
+
+## Pre-requisites
+
+1. An AWS account
+2. An IAM user in that account with privileges to add and remove a wide range of infrastructure (the built-in Administrator policy will work, or you can make a more tailored policy if desired)
+3. AWS credentials for that user (`AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY`)
+4. An Alchemy account with an active subscription, and an app in that account with access to the following blockchains:
+   - Ethereum
+   - Base
+   - Arbitrum One
+   - OP Mainnet
+   - Polygon Mainnet
+   - ZKSync Mainnet
+   - Linea Mainnet
+   - XMTP Sepolia
+5. A private key for your node, which can be generated using the instructions in the `xmtpd` repo [here](https://github.com/xmtp/xmtpd/blob/main/doc/onboarding.md)
+
+## Register a domain
+
+1. Choose a new domain name for your node
+2. Register the domain in [Route53](https://us-east-1.console.aws.amazon.com/route53/v2/home?region=us-east-2#Dashboard)
+3. Wait for the registration to complete (may take 15-20 minutes)
+
+## Deploying into a new VPC
+
+### Set up terraform variables
+
+#### With Terraform Cloud
+
+1. Create a workspace named `xmtp-testnet`
+2. Add the following variables to the workspace
+
+```terraform
+verifier_chain_rpc_urls = {
+    chain_rpc_1 = $ETHEREUM_RPC_URL
+    chain_rpc_8453 = $BASE_RPC_URL
+    chain_rpc_42161 = $ARBITRUM_ONE_RPC_URL
+    chain_rpc_10 = $OP_MAINNET_RPC_URL
+    chain_rpc_324 = $POLYGON_MAINNET_RPC_URL
+    chain_rpc_59144 = $LINEA_MAINNET_RPC_URL
+}
+
+nodes_contract_address = "0x390D339A6C0Aa432876B5C898b16287Cacde2A0A"
+messages_contract_address = "0x162f2d4d96565437F47bfB7a0BF8AC4FF481Bbf6"
+identity_updates_contract_address = "0x00e92e15AB0D7d3aA5c76bceCcE675DcAf311189"
+chain_rpc_url = $XMTP_SEPOLIA_RPC_URL
+signer_private_key = $GENERATED_PRIVATE_KEY
+domain_name = $YOUR_NEW_DOMAIN_NAME
+```
+
+#### Without Terraform Cloud
+
+1. Create a file named `terraform.tfvars` in the `examples/aws-complete` folder
+2. Add the following secrets to the file, with any variables substituted with the appropriate values from your accounts
+
+```terraform
+verifier_chain_rpc_urls = {
+    chain_rpc_1 = $ETHEREUM_RPC_URL
+    chain_rpc_8453 = $BASE_RPC_URL
+    chain_rpc_42161 = $ARBITRUM_ONE_RPC_URL
+    chain_rpc_10 = $OP_MAINNET_RPC_URL
+    chain_rpc_324 = $POLYGON_MAINNET_RPC_URL
+    chain_rpc_59144 = $LINEA_MAINNET_RPC_URL
+}
+
+nodes_contract_address = "0x390D339A6C0Aa432876B5C898b16287Cacde2A0A"
+messages_contract_address = "0x162f2d4d96565437F47bfB7a0BF8AC4FF481Bbf6"
+identity_updates_contract_address = "0x00e92e15AB0D7d3aA5c76bceCcE675DcAf311189"
+chain_rpc_url = $XMTP_SEPOLIA_RPC_URL
+signer_private_key = $GENERATED_PRIVATE_KEY
+domain_name = $YOUR_NEW_DOMAIN_NAME
+```
+
+### Deploy the plan
+
+#### With Terraform Cloud
+
+1. `cd ./examples/aws-complete`
+2. Modify the file `_providers.tf` and set the organization to your Terraform Cloud organization and the workspace to a new workspace in your organization.
+3. In Terraform Cloud make sure the `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` environment variables are set to the credentials for your Terraform IAM user
+4. `terraform init` (you may need to run `terraform login` first if you have never used the Terraform CLI before)
+5. `terraform plan` and review the plan
+6. `terraform apply`
+
+#### Without Terraform Cloud
+
+1. `cd ./examples/aws-complete`
+2. In the `_providers.tf` file, remove the `cloud` block
+3. `terraform init`
+4. `terraform apply`