[RFE] Documentation on feature matrix comparision with alternatives

[hgkamath]

The readme says Inspired by Xilem, Leptos and rui .

First, a Thank-you to developers for your contribution towards open-source rust gui renderer.

Please create a doc/featmatrix.md file with the following information in detail, and link it in to the readme.
What a user would like to know

• What design choices are different, tradeoffs, and how they affect a final rendering?
• What each choice does and does not do (as of today)?
• How should a user choose between alternatives ?

On a related note, one also needs a up-to-date API documentation, functional call, arguments etc.

I've read Levien's blogs (https://raphlinus.github.io/), He may not have touched as much on floem. but you should also write a comprehensive and self-contained write-up, even if it repeats some of his observations.