Extending audiobook documentation

[codeperfectplus]

Is your feature request related to a problem? Please describe.

Current Documentation is not sufficient. we have to extend it.

Plan for Docs

will use Sphinx¶ for documentation and write proper multipage documentation.

This issue is open to assigning.

Branch:- https://github.com/Py-Contributors/AudioBook/tree/docs

Reference:-

https://pypdf2.readthedocs.io/en/latest/
https://flask.palletsprojects.com/en/2.2.x/