Write documentation

The whole documentation is missing and should be added.
It should cover basic usage but also have sections for every single component which describes it in detail for more advanced usage.

Every single improvement is welcome, so don't mind if you only add a single sentence or a whole section.
Atm the unittests are a good place to see some usage examples. But also the demo apps should get more content to look at.
If there are any questions I will ry to answer all of them.

Start by reviewing the unit tests for usage examples and the demo apps to understand the project surface. Define a documentation structure covering basic usage and a detailed section for every component, then expand the demo-app content. Done means the requested coverage exists and explains both basic and advanced usage.

Written by the indexing model from the issue text.