Set up sphinx documentation and plugin the extension for redoc

Use [this](https://sphinxcontrib-redoc.readthedocs.io/en/stable/) extension after you have [sphinx](https://www.sphinx-doc.org/en/master/) set up.

- [x] Set up Sphinx basics #46
- [x] get it running on https://readthedocs.io/
- [x] Set up openAPI plugin with sphinx #47
- [ ] Set up the documentation for the purpose of the project and the potential use cases.
- [ ] Set up the documentation for the installation of the project