Nimble package with external shared library
Some package rely on an external shared library (https://github.com/SciNim/flambeau for example). 

To make things easier, the download, extract eventually build of the library is wrapped by a Nimble task in a vendor folder (that is not in git configuration).

Where should these external library be installed in nimble to be used easily with package ? 

Should a ``libs`` folder inside ``nimbleFolder`` be added (in the same way as ``bin`` ? Should we put libraries as binary inside ``bin`` ?
