feat: begin back end

back-end/.gitignore

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+node_modules
+package-lock.json
+dist/

back-end/package.json

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+{
+    "name": "back-end",
+    "version": "1.0.0",
+    "main": "dist/app.js",
+    "scripts": {
+        "start": "tsc && node dist/app.js",
+        "build": "tsc",
+        "test": "echo \"Error: no test specified\" && exit 1"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC",
+    "description": "",
+    "devDependencies": {
+        "@types/express": "^5.0.0",
+        "globals": "^15.11.0",
+        "typescript": "^5.6.3"
+    },
+    "dependencies": {
+        "express": "^4.21.1"
+    }
+}

back-end/src/app.ts

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+import express from 'express';
+const app = express();
+const port = 3000;
+
+app.get('/', (req, res) => {
+    res.send('Hello World!');
+});
+
+app.listen(port, () => {
+    return console.log(`Express is listening at http://localhost:${port}`);
+});

back-end/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "esModuleInterop": true,
+    "target": "es6",
+    "moduleResolution": "node",
+    "sourceMap": true,
+    "outDir": "dist"
+  },
+  "lib": ["es2015"]
+}