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

services/finance/README.md

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+# Finance Service
+
+Service for payments, ledgers, rate models, and invoicing.
+
+## Features
+
+- Double-entry ledger
+- Payment processing
+- Rate models
+- Invoicing
+- Deal milestone tracking
+
+## Development
+
+```bash
+# Install dependencies
+pnpm install
+
+# Run development server
+pnpm dev
+
+# Build
+pnpm build
+
+# Start production server
+pnpm start
+```
+
+## API Endpoints
+
+- `GET /health` - Health check
+- `POST /ledger/entry` - Create ledger entry
+- `POST /payments` - Process payment
+
+## Environment Variables
+
+- `PORT` - Server port (default: 4003)
+- `DATABASE_URL` - PostgreSQL connection string
+- `PAYMENT_PROVIDER` - Payment provider configuration
+

services/finance/package.json

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+{
+  "name": "@the-order/finance",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Finance service: payments, ledgers, rates",
+  "main": "./src/index.ts",
+  "scripts": {
+    "dev": "tsx watch src/index.ts",
+    "build": "tsc",
+    "start": "node dist/index.js",
+    "lint": "eslint src --ext .ts",
+    "type-check": "tsc --noEmit"
+  },
+  "dependencies": {
+    "fastify": "^4.25.2",
+    "@the-order/schemas": "workspace:*"
+  },
+  "devDependencies": {
+    "@types/node": "^20.10.6",
+    "typescript": "^5.3.3",
+    "tsx": "^4.7.0",
+    "eslint": "^8.56.0"
+  }
+}
+

services/finance/src/index.ts

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+/**
+ * Finance Service
+ * Handles payments, ledgers, rate models, and invoicing
+ */
+
+import Fastify from 'fastify';
+
+const server = Fastify({
+  logger: true,
+});
+
+// Health check
+server.get('/health', async () => {
+  return { status: 'ok' };
+});
+
+// Ledger operations
+server.post('/ledger/entry', async (request, reply) => {
+  // TODO: Implement ledger entry
+  return { message: 'Ledger entry endpoint - not implemented yet' };
+});
+
+// Payment processing
+server.post('/payments', async (request, reply) => {
+  // TODO: Implement payment processing
+  return { message: 'Payment endpoint - not implemented yet' };
+});
+
+// Start server
+const start = async () => {
+  try {
+    const port = Number(process.env.PORT) || 4003;
+    await server.listen({ port, host: '0.0.0.0' });
+    console.log(`Finance service listening on port ${port}`);
+  } catch (err) {
+    server.log.error(err);
+    process.exit(1);
+  }
+};
+
+start();
+

services/finance/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"]
+}
+