add button to upload

frontend/src/components/Homepage.jsx

@@ -1,13 +1,21 @@
+import { Link } from 'react-router-dom';
+
 function Homepage() {
   return (
     <div className="min-h-screen bg-gray-50 flex items-center justify-center">
       <div className="text-center">
         <h1 className="text-4xl font-bold text-gray-900 mb-4">
-          Hello World
+          PDF Interrogation App
         </h1>
-        <p className="text-lg text-gray-600">
-          PDF Interrogation App - Coming Soon
+        <p className="text-lg text-gray-600 mb-8">
+          Upload a PDF and engage in interactive learning through AI-powered Socratic questioning
         </p>
+        <Link 
+          to="/upload" 
+          className="bg-blue-500 hover:bg-blue-700 text-white font-bold py-3 px-6 rounded-lg transition-colors duration-200 inline-block"
+        >
+          Get Started
+        </Link>
       </div>
     </div>
   );