add qr lib

index.html

@@ -14,6 +14,7 @@
         <button id="generate-btn" class="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded">Generate QR Code</button>
         <canvas id="qr-code" class="mt-4"></canvas>
     </div>
+    <script src="https://cdn.jsdelivr.net/npm/qrcode@1.5.1/build/qrcode.min.js"></script>
     <script src="script.js"></script>
 </body>
 </html>