feat: add qr code

index.html

@@ -8,10 +8,13 @@
 <body>
   <h1>Send SMS Deeplink Example</h1>
   <p>Click the link below to open your SMS app with a message ready to send:</p>
-  <a href="sms:+1234567890?body=Hello%20this%20is%20a%20test%20message" 
-     target="_blank" 
+  <a href="sms:+1234567890?body=Hello%20this%20is%20a%20test%20message"
+     target="_blank"
      rel="noopener noreferrer">
     Send SMS to +1234567890
   </a>
+
+  <h2>QR</h2>
+  <img src="img/demo.png" alt="QR" />
 </body>
 </html>