feat: initialize backend and frontend structure with Docker support

- Added backend package.json with dependencies for Express, MySQL, and EJS.
- Created server.js for backend server setup with basic routing and error handling.
- Added EJS view for the index page.
- Set up Docker Compose configuration for frontend, backend, and MySQL database services.
- Created Dockerfile for frontend build process using Node and Nginx.
- Configured Nginx for serving frontend application.
- Implemented i18n setup for internationalization with English and German language support.
- Added localization files for English and German languages.

backend/server.js

@@ -0,0 +1,24 @@
+import express from "express";
+import cors from "cors";
+
+const app = express();
+const PORT = process.env.PORT;
+app.set("view engine", "ejs");
+
+app.use(cors());
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
+
+app.get("/", (req, res) => {
+  res.render("index");
+});
+
+app.listen(PORT, () => {
+  console.log(`Server is running on http://localhost:${PORT}`);
+});
+
+// error handling code
+app.use((err, req, res, next) => {
+  console.error(err.stack);
+  res.status(500).send("Something broke!");
+});