quiz init commit

services/QRCodeService.js

@@ -0,0 +1,16 @@
+const QRCode = require('qrcode');
+
+module.exports = {
+  /**
+   * Generate QRCode
+   * @param {string} text QRCode string
+   */
+  generateQRCode: async function (text) {
+    return new Promise((resolve, reject) => {
+      QRCode.toDataURL(text, (error, url) => {
+        if (error) reject(error);
+        else resolve(url);
+      });
+    });
+  },
+};