How to implement (a javascript pdf reader) in my app?

I have recently created a pdf application in which I used to open Google drive links in web viewer to display my PDF’s. Just got to know this website and saw its demo.
Looks perfect with much more tools available than Google Drive. I wanted to implement this pdf viewer in my Kodular app. Do I need to download something?? All these CDN things etc are out of my understanding. I am familiar with HTML and CSS but not JS. Can anyone please help me out with this? I am really interested in implementing this pdf viewer into my application. Looking forward to your replies.
Official page - PDF.js
Demo - GitHub - mozilla/pdf.js: PDF Reader in JavaScript
Github Project - GitHub - mozilla/pdf.js: PDF Reader in JavaScript

Please reply as this is vital for my project

what about doing a search in the community?