Improve Documentation

[ScottPierce]

Thank you for maintaining this library! We desperately need something like this in the community.

The documentation is a little lacking, primarily on compatibility with what versions of Kotlin and Compose. I'm about to try out your library and I'm not confident whether it will work with my version of Kotlin / Compose.

There are also other things that seem to be lacking in the documentation around the configurability of the memory and disk caches.