docs: Update README with installation and usage instructions

README.md

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+# Contributoor
+
+Contributoor is a lightweight service that runs alongside an Ethereum consensus client and collects data via the client's APIs. It's a streamlined, user-friendly extraction of the `sentry` service from [ethpandaops/xatu](https://github.com/ethpandaops/xatu).
+
+## Installation
+
+See the [contributoor-installer](https://github.com/ethpandaops/contributoor-installer) repository for supported platforms and installation instructions.
+
+There are three ways to install Contributoor:
+
+1. **Docker (Recommended)**
+   - Provides the most consistent environment
+   - Easy to update and maintain
+
+2. **Systemd/Launchd**
+   - Native system service integration
+   - Automatic startup on boot
+
+3. **Binary (for development)**
+   - Direct execution
+   - Minimal dependencies
+
+## Getting Started
+
+Once installed, you can manage the Contributoor service using these commands:
+
+```bash
+contributoor start    # Start the service
+contributoor stop     # Stop the service
+contributoor status   # Check service status
+contributoor restart  # Restart the service
+contributoor config   # View/edit configuration
+contributoor update   # Update the service to the latest version
+```
+
+## Development
+
+### Running Locally
+
+To run Contributoor in development mode:
+
+```bash
+go run ./cmd/sentry/main.go --config /path/to/.contributoor/config.yaml --debug true
+```
+
+The `config.yaml` would have been generated for you by the installer.
+
+### Code Generation
+
+Generate protocol buffers and other generated code:
+
+```bash
+go generate ./...
+make proto
+```
+
+### Testing
+
+Run tests with race detection, coverage reporting, and view the coverage report:
+
+```bash
+go test -race -failfast -cover -coverpkg=./... -coverprofile=coverage.out ./... && go tool cover -html=coverage.out
+```
+
+## Contributing
+
+Contributoor is part of EthPandaOps' suite of tools for Ethereum network operations. Contributions are welcome! Please check our [GitHub repository](https://github.com/ethpandaops) for more information.