added qr code to copyDialog

Co-authored-by: timvisee <tim@visee.me>

app/ui/qr.js

@@ -0,0 +1,10 @@
+const raw = require('choo/html/raw');
+const qrcode = require('../qrcode');
+
+module.exports = function(url) {
+  const gen = qrcode(5, 'L');
+  gen.addData(url);
+  gen.make();
+  const qr = gen.createSvgTag({ scalable: true });
+  return raw(qr);
+};