add examples folder and documentation

- provide ready to run examples
- write documentation on available methods
- create a static web app with [Karax](https://github.com/karaxnim/karax) ?

Start by inspecting the repository structure and the library's public methods. Define the scope for a ready-to-run examples folder, documentation covering available methods, and the proposed static Karax web app. Done means the examples run, the documented methods match the library, and the web app is complete if that part is retained.

Written by the indexing model from the issue text.