docs: add "badges" to README

[castarco]

Add some "nice" badges to the README, so people can have a better idea about "quality metrics" at first sight.

[Tejoooo]

Heyy @castarco I m interested in this work can u assign me this issue

[castarco]

Hi @Tejoooo . Yes, it's all yours.

One detail, though: Please, do not add badges that contain hardcoded values (except for the license). I already closed a PR from another person that did that and doubled down on that approach after I commented that it was not a good idea.

[Tejoooo]

So @castarco wht am I supposed to do exactly , can you give me more details of your context.

[castarco]

@Tejoooo you can take inspiration from other projects I'm maintaining.

For example https://raw.githubusercontent.com/Coder-Spirit/nominal/main/README.md

Note, though, that the example I gave you is a simple repository, while this one is a monorepo, so we need badges for README files of the 3 subprojects, and badges for the "global" README (the global README does not need badges related to any specific package, of course, just the ones that are generic enough for the repository).

EDIT: I'm taking care of the Snyk integrations.