How does example.py explain how to create plugins?

New to coding…

example.py downloaded ‘read me’ says:

-‘example.py’ explains how to create plugins.

How does it explain? Since my server didn’t supported by stable version, how can I be able to see it? Testing version just gives some outputs. Do I have to pay and login isro for that? I am hesitant since I dunno it will work or not.

https://projecthax.gitbook.io/phbot-plugins/