Remove examples, add description for design goals in README.md and
apply re-names and naming changes accordingly for the project structure.
Implement a flat hierachry, as the library shall remain pretty simple.
feat(app): add minimal size argument for App.start
Read more corresponding inputs from stdin and convert them correctly
(i.e. in band window resizing), further keys (arrow keys, F-keys, etc.).
Respect the provided minimal size for the application which posts an
error message in case the size is smaller than the requested minimal
size.
