Thx + Optional AppImage support

[kai-tub]

Hey :wave:

Thanks again for this lovely library!

I have created a thin wrapper around this CLI tool including the plugins via nix at https://github.com/kai-tub/audible-cli-appimage. As the name suggests, the main purpose is to package a simple AppImage for Linux users that handles the dependencies (Python and FFmpeg). So now, Linux users can download and run the AppImage directly from GitHub to download and decrypt their audiobooks without any package-manager issues.

One core goal of AppImages is to target upstream distribution instead of a 'forked' version, as explained in the docs.

The AppImage ecosystem is built around the notion of “upstream packaging”. With AppImage, typically the application author is who packages and distributes the application. This is different from the traditional Linux distribution model, where the application author and the application packager (also called the maintainer) are often different persons.

If you like, I am happy to upstream the repository but I am well aware that it brings quite a lot of additional maintenance burden, especially since this would be a "Linux-only" feature. If this isn't something you aren't interesting in, I totally get it :D

I just try to contribute in some way. :+1: