FIles in GutHub but not in package

["Eric Claeys" <AstroEric@xxxxxxxxxx>]

I'd like to store some files on our GitHub site, but not have them included
when someone grabs our repository via:
    git clone --recursive https://github.com/thomasjacquin/allsky.git

Is that possible, and if so, how?  I prefer to use the GitHub web interface
to do this.

Thanks - Eric