A simple structure for the layers of the project (#66)

Author: ggonzalez94

src/README.md

@@ -0,0 +1,17 @@
+# Contracts
+
+This directory contains the smart contracts for the stack.
+The most important contracts are in the `protocol` directory. These are the core contracts and interfaces that are central to the functionality of any rollup that uses the stack.
+Contracts in other directories are not part of the core protocol, but still provide useful functionality that most rollups will want to use.
+
+## Project Structure
+
+```
+src/
+├── blobs/ --> Common registry to store blob references
+├── bridges/ --> Bridge implementations for common token standards
+├── libs/  --> Utility libraries used by other contracts in this repository or that applications may use
+├── protocol/ --> Core contracts and interfaces
+│   ├── taiko_alethia/ --> Opinionated implementations for the Taiko Alethia rollup
+├── vendor/ --> Contracts and libraries from other projects that we use
+```

src/protocol/taiko_alethia/IDelayedInclusionStore.sol src/protocol/IDelayedInclusionStore.sol

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.28;
+
+interface IInbox {
+    function publish(uint256 nBlobs, uint64 anchorBlockId) external;
+}

src/protocol/IInbox.sol

@@ -5,10 +5,11 @@ import {IBlobRefRegistry} from "../../blobs/IBlobRefRegistry.sol";
 
 import {IPublicationFeed} from "../IPublicationFeed.sol";
 
-import {IDelayedInclusionStore} from "./IDelayedInclusionStore.sol";
-import {ILookahead} from "./ILookahead.sol";
+import {IDelayedInclusionStore} from "../IDelayedInclusionStore.sol";
+import {IInbox} from "../IInbox.sol";
+import {ILookahead} from "../ILookahead.sol";
 
-contract TaikoInbox {
+contract TaikoInbox is IInbox {
     struct Metadata {
         uint256 anchorBlockId;
         bytes32 anchorBlockHash;