feat(challenge_12): refactor src code and setup docker

backend/.dockerignore

+node_modules
+npm-debug.log
+dist
+build
+.env
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backend/Dockerfile

+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+
+RUN npm install -g pnpm
+
+RUN pnpm install
+
+COPY . .
+
+EXPOSE 3000
+
+CMD ["pnpm", "run", "dev"]
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backend/README.md

+để start backend Express
+`docker compose up -d` 
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backend/docker-compose.yml

+version: '3.5'
+
+services:
+  express_app:
+    container_name: backend-challenge
+    build: .
+    restart: always
+    ports:
+      - "3000:3000"
+    env_file:
+      - .env
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database/README.md

+để start database
+`docker compose up -d` 
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readme.md

-Hello 
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