Added QrCode modal window to short URLs

src/short-urls/helpers/QrCodeModal.js

@@ -0,0 +1,16 @@
+import React from 'react'
+import { Modal, ModalBody, ModalHeader } from 'reactstrap';
+import './QrCodeModal.scss';
+
+export default function QrCodeModal ({ url, toggle, isOpen }) {
+  return (
+    <Modal isOpen={isOpen} toggle={toggle} centered={true}>
+      <ModalHeader toggle={toggle}>QR code for <a target="_blank" href={url}>{url}</a></ModalHeader>
+      <ModalBody>
+        <div className="text-center">
+          <img src={`${url}/qr-code`} className="qr-code-modal__img" />
+        </div>
+      </ModalBody>
+    </Modal>
+  );
+}