[Request] Please improve the Documentation

[AllTheGoodOnesWereTaken]

At this point the documentation on this version is extremely poor compared to the original custom-elements package, so i see no reason to switch to this version just yet.
It's important to note exactly which Browsers you support and which you tested this on, and we need more code examples and tutorials on how to set this all up properly, how to access our data if we need it, things like that.

Would also be nice to see how this implementation performs when compared to React Fiber & StencilJS using an implementation of their common performance demo :)

https://stencil-fiber-demo.firebaseapp.com/perf.html

[yyx990803]

1. This is not meant as a replacement of the "original", you can keep using that if you find it suit your use case better. The usage is simple enough and I don't think extra documentation is really necessary, but I'm open to PRs.

2. That performance demo has nothing to do with web components. It's a demo about vdom diffing.