Add React build process for full-stack deployment

- Integrated React app in a 'client' directory and added a build script in the root package.json to build the frontend.
- Updated package.json with "build" script to navigate to the client directory, install dependencies, and run npm build.
- Configured Express server to serve static files from the React build directory, enabling full-stack deployment from a single server.
- Ensures production-ready React files are served alongside the Node.js backend for streamlined deployment.

This setup supports building and deploying both frontend and backend in a full-stack environment.

Author: KazerL

package.json

@@ -1,9 +1,11 @@
 {
   "name": "ai-object-recognition",
   "version": "1.0.0",
-  "description": "A complex Node.js project",
+  "description": "An AI-powered full-stack application",
   "main": "index.js",
   "scripts": {
+    "build": "cd client && npm install && npm run build",
+    "start": "node index.js",
     "test": "echo \"No tests specified\" && exit 0"
   },
   "author": "Project Code Dev Team",