Update README.md with installation instructions and Docker usage; add docker-compose.yml for service orchestration

docker-compose.yml

@@ -0,0 +1,27 @@
+version: '3.8'
+
+services:
+  timetracker:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: timetracker-app
+    ports:
+      - "3000:3000"
+    volumes:
+      # Persistent volume for SQLite database
+      - timetracker-data:/app/db
+    environment:
+      - NODE_ENV=production
+      - PORT=3000
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "node", "-e", "require('http').get('http://localhost:3000/', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"]
+      interval: 30s
+      timeout: 3s
+      retries: 3
+      start_period: 5s
+
+volumes:
+  timetracker-data:
+    driver: local