Added 3-clause BSD license to the repository
Added 3-clause BSD license to the repository

Change-Id: I7060761dfa259d86432fcc6c699f95b7191c841e

OpenChemistry/avogadroapp,ghutchis/avogadroapp,OpenChemistry/avogadroapp,wadejong/avogadroapp,OpenChemistry/avogadroapp,OpenChemistry/avogadroapp,ghutchis/avogadroapp,ghutchis/avogadroapp,wadejong/avogadroapp,wadejong/avogadroapp,ghutchis/avogadroapp