check the formating of README.md in te generated package and add a header

[fdiblen]

Checklist before submitting an issue

• I have checked the existing issues and couldn't find an issue about this bug.

Issue details

• README.md
  • Has no title / h1 header
  • Extra empty lines

_Originally posted by @OleMussmann in #554

[abelsiqueira]

Maybe we should add formatting and linting to markdown files and cover this as a side effect?