Create README.md

README.md

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+# Morph Reth
+
+## Overview
+
+Morph Reth is the next-generation execution client for [Morph](https://www.morph.network/), a decentralized Layer 2 scaling solution for Ethereum. Built on the modular [Reth SDK](https://github.com/paradigmxyz/reth), it provides high-performance block execution with Morph-specific features.
+
+### Key Features
+
+- **L1 Message Support**: Native handling of L1-to-L2 deposit messages with queue index validation
+- **Alt Fee Tokens**: Support for paying transaction fees in alternative ERC-20 tokens
+- **Custom Receipt Types**: Extended receipt format with L1 fee tracking
+- **Morph Hardforks**: Full support for Morph's upgrade schedule (Bernoulli, Curie, Morph203, Viridian, Emerald)
+
+## Architecture
+
+Morph Reth is designed as a modular extension of Reth, following the SDK pattern:
+
+```
+morph-reth/
+├── crates/
+│   ├── chainspec/       # Morph chain specification and hardfork definitions
+│   ├── consensus/       # L2 block validation (header, body, L1 messages)
+│   ├── evm/             # EVM configuration and block execution
+│   ├── payload/
+│   │   ├── builder/     # Block building logic
+│   │   └── types/       # Engine API types (ExecutableL2Data, etc.)
+│   ├── primitives/      # Core types (transactions, receipts)
+│   └── revm/            # L1 fee calculation, token fee logic
+```
+
+### Crates
+
+| Crate | Description |
+|-------|-------------|
+| `morph-chainspec` | Chain specification with Morph hardfork timestamps |
+| `morph-consensus` | Consensus validation for L2 blocks |
+| `morph-evm` | EVM configuration and receipt builder |
+| `morph-payload-types` | Engine API payload types |
+| `morph-payload-builder` | Block building implementation |
+| `morph-primitives` | Transaction and receipt types |
+| `morph-revm` | L1 fee and token fee calculations |
+
+## Getting Started
+
+### Prerequisites
+
+- Rust 1.82.0 or later
+- Cargo
+
+### Building from Source
+
+```bash
+git clone https://github.com/morph-l2/morph-reth.git
+cd morph-reth
+cargo build --release
+```
+
+### Running Tests
+
+```bash
+# Run all tests
+cargo test --all
+
+# Run tests for a specific crate
+cargo test -p morph-consensus
+```
+
+### Development
+
+```bash
+# Format code
+cargo +nightly fmt --all
+
+# Run clippy
+cargo clippy --all --all-targets -- -D warnings
+
+# Check documentation
+cargo doc --no-deps --document-private-items
+```
+
+## Morph L2 Specifics
+
+### Transaction Types
+
+Morph supports the following transaction types:
+
+| Type | ID | Description |
+|------|-----|-------------|
+| Legacy | `0x00` | Standard legacy transactions |
+| EIP-2930 | `0x01` | Access list transactions |
+| EIP-1559 | `0x02` | Dynamic fee transactions |
+| EIP-7702 | `0x04` | Account abstraction transactions |
+| L1 Message | `0x7e` | L1-to-L2 deposit messages |
+| Alt Fee | `0x7f` | Alternative fee token transactions |
+
+### L1 Messages
+
+L1 messages are special deposit transactions that originate from Ethereum L1:
+
+- Must appear at the beginning of each block
+- Must have strictly sequential `queue_index` values
+- Gas is prepaid on L1, so no L2 gas fee is charged
+- Cannot be sent via the mempool (sequencer only)
+
+### Hardforks
+
+| Hardfork | Description |
+|----------|-------------|
+| Bernoulli | Initial L2 launch |
+| Curie | EIP-1559 fee market activation |
+| Morph203 | Various improvements |
+| Viridian | Fee vault and alt fee support |
+| Emerald | Block time 300ms |
+
+### Development Setup
+
+1. Fork and clone the repository
+2. Create a new branch for your feature
+3. Make your changes with tests
+4. Ensure all checks pass: `cargo fmt`, `cargo clippy`, `cargo test`
+5. Submit a pull request
+
+## Links
+
+- [Morph Website](https://morph.network/)
+- [Morph Documentation](https://docs.morph.network/)
+- [Morph GitHub](https://github.com/morph-l2)
+- [Reth Documentation](https://reth.rs/)