1- We proceed to download the external push notification library
https://codeload.github.com/Nickersoft/push.js/zip/master
2- We load the external library in our scriptcase, we can follow this tutorial if necessary: https://www.youtube.com/watch?v=nPiAVJZBbq8
3- Once the external library is created, we must activate it
4- The route of our bookstore
5- Finally we make the call to the library in a blank application, along with the creation of notification message
