ažuriran readme

README.md

@@ -95,6 +95,14 @@ The MongoDB server v > 5.0 will not run on and old machine such as Acer Revo due
 
 This issue was solved by using an older Mongo DB Version 4.4.27
 
+## Decoding Barcode
+
+Barcode decoding is slow and can lead to locking of the main thread.
+This heavy lifting could be moved to background thread.
+
+The new solution could be based on the following code: https://github.com/pocesar/react-use-qrcode
+That solution uses video to decode the QR code. This could be modified so that it uses data stored in canvas.
+
 # OAuth verification video transcript
 
 This is Rezije app demonstration for Google OAuth login process for the users of our app.