✨ Add express backend server

server/.eslintrc

@@ -0,0 +1,6 @@
+{
+  "env": {
+    "node": true,
+    "commonjs": true
+  }
+}

server/index.js

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+import express from "express";
+const app = express();
+const port = process.send.PORT || 3000;
+
+app.get("/", (req, res) => {
+  res.send("Hello World!");
+});
+
+app.listen(port, () => {
+  console.log(`Server listening on http://localhost:${port}`);
+});

server/package.json

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+{
+  "name": "timetable-server",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "minie4",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.18.1"
+  }
+}