Add a couple of use cases from the upcoming paper showing the corresponding Thymeleaf dialect with HtmlFlow

[fmcarvalho]

The upcoming paper about HtmlFlow includes a couple of use cases comparing dialects between Thymeleaf and HtmlFlow, which should be included here in documentation.

[fmcarvalho]

I included the most common use cases for data binding, if/else, and loops usage, in GitHub README.

Also in https://htmlflow.org/features I have included the same examples implemented with both approaches: HtmlDoc and HtmlView