Update README.md to provide a comprehensive overview of The Order monorepo, including repository structure, quickstart guide, development workflow, and contribution guidelines.

packages/crypto/README.md

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+# @the-order/crypto
+
+KMS/HSM client, key management, and signatures for eIDAS/DID.
+
+## Usage
+
+```typescript
+import { KMSClient, SignatureService } from '@the-order/crypto';
+
+const kms = new KMSClient(config);
+const signatureService = new SignatureService(kms);
+
+const signature = await signatureService.sign(data, options);
+```
+
+## Features
+
+- KMS/HSM integration
+- Key management
+- Digital signatures
+- eIDAS/DID support
+

packages/crypto/package.json

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+{
+  "name": "@the-order/crypto",
+  "version": "0.1.0",
+  "private": true,
+  "description": "KMS/HSM client, key management, and signatures for eIDAS/DID",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsc --watch",
+    "lint": "eslint src --ext .ts",
+    "type-check": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@aws-sdk/client-kms": "^3.490.0"
+  },
+  "devDependencies": {
+    "@types/node": "^20.10.6",
+    "typescript": "^5.3.3"
+  }
+}
+

packages/crypto/src/index.ts

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+/**
+ * The Order Crypto Package
+ */
+
+export * from './kms';
+export * from './signature';
+

packages/crypto/src/kms.ts

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+/**
+ * KMS/HSM client for key management
+ */
+
+export interface KMSConfig {
+  provider: 'aws' | 'gcp' | 'azure' | 'hsm';
+  keyId: string;
+  region?: string;
+}
+
+export class KMSClient {
+  constructor(private config: KMSConfig) {}
+
+  async encrypt(plaintext: Buffer): Promise<Buffer> {
+    // Implementation for encryption
+    throw new Error('Not implemented');
+  }
+
+  async decrypt(ciphertext: Buffer): Promise<Buffer> {
+    // Implementation for decryption
+    throw new Error('Not implemented');
+  }
+
+  async sign(data: Buffer): Promise<Buffer> {
+    // Implementation for signing
+    throw new Error('Not implemented');
+  }
+
+  async verify(data: Buffer, signature: Buffer): Promise<boolean> {
+    // Implementation for signature verification
+    throw new Error('Not implemented');
+  }
+}
+

packages/crypto/src/signature.ts

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+/**
+ * Signature utilities for eIDAS/DID
+ */
+
+import { KMSClient } from './kms';
+
+export interface SignatureOptions {
+  algorithm: 'RS256' | 'ES256' | 'EdDSA';
+  keyId: string;
+}
+
+export class SignatureService {
+  constructor(private kms: KMSClient) {}
+
+  async sign(data: Buffer, options: SignatureOptions): Promise<Buffer> {
+    return this.kms.sign(data);
+  }
+
+  async verify(
+    data: Buffer,
+    signature: Buffer,
+    options: SignatureOptions
+  ): Promise<boolean> {
+    return this.kms.verify(data, signature);
+  }
+
+  async signJSON(data: unknown, options: SignatureOptions): Promise<string> {
+    const jsonString = JSON.stringify(data);
+    const signature = await this.sign(Buffer.from(jsonString), options);
+    return signature.toString('base64');
+  }
+}
+

packages/crypto/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist", "**/*.test.ts", "**/*.spec.ts"]
+}
+