feat: Add base files

backend/db.js

@@ -0,0 +1,18 @@
+const mysql = require('mysql2');
+
+const connection = mysql.createConnection({
+  host: 'db',
+  user: 'root',
+  password: 'root',
+  database: 'vulnapp',
+});
+
+connection.connect(err => {
+  if (err) {
+    console.error('DB connection failed:', err.stack);
+    return;
+  }
+  console.log('Connected to MySQL');
+});
+
+module.exports = connection;