Build instructions are crap

[bib1963]

Please update the build instructions with the correct procedures. At the moment, they are complete garbage. Please redo them from a pristine system. As with all the other repositories.

[Nikokrock]

Are you referring to https://github.com/AdaCore/gnatcoll-core/blob/master/README.md ? or the gnatcoll core doc ? The doc is indeed not up-to-date. Please give us more details

Also, please keep your feedback professional and constructive. Phrases like "complete garbage" or "crap" do not help identify the actual technical issue and create a hostile environment for contributors.

Thanks in advance