link to play store app in qr code dialog

lnbits/extensions/boltcards/templates/boltcards/index.html

@@ -370,7 +370,12 @@
         ></qrcode>
       </q-responsive>
       <p style="word-break: break-all" class="text-center">
-        (QR code is for setting the keys with bolt-nfc-android-app)
+        (QR code is for setting the keys with
+        <a
+          href="https://play.google.com/store/apps/details?id=com.lightningnfcapp"
+          target="_blank"
+          >bolt-nfc-android-app</a
+        >)
       </p>
       <p style="word-break: break-all">
         <strong>Name:</strong> {{ qrCodeDialog.data.name }}<br />