Add to 7GUIs

I think it'd be good to add this cool UI lib to [7GUIs](https://github.com/eugenkiss/7guis ) (ideally including also [additional proposals](https://github.com/eugenkiss/7guis/issues )) to ease understanding of its usage for newcomers as well as to compare its capabilities and approaches with other UI libs side by side in a fair comparison.

It'd also partially pinpoint whether layouting and "live" capabilities are well enough architectured or whether there are some sharp edges.