fixed readme

frontend/vite.config.js

@@ -0,0 +1,10 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+
+export default defineConfig({
+  plugins: [react()],
+  server: {
+    port: 3002,   // choose your port
+    strictPort: true // fail if port is in use
+  }
+});