Add badge info

[aochmann]

• build
• nuget
• github packages
• code coverage

[aochmann]

https://github.com/badges/shields

[aochmann]

https://github.com/Naereen/badges

[aochmann]

Can be combined with build workflow: #45

[mzajkowski]

Let's have a discussion here.

Why action is failing at the moment? Same what I mentioned on the PR - do we want to have a Github Packages status output as well? cc: @aochmann

[aochmann]

Somethings wrong with releasing to GitHub Packages - something changes. I need to separate build, changelog and releasing workflows.

It could be great to have also GitHib Packages badge.