Add breeze icons for ROOT cern files
Summary:
The original logos can be founded here: https://root.cern.ch/img/logos/ROOT_Logo/ROOT_Logo.pdf
I have used the blue color, which is also used for ROOT's website banner and logo.
Test Plan:
Reviewers: VDG, ndavis, ngraham
Reviewed By: VDG, ndavis, ngraham
Subscribers: trickyricky26, ndavis, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D23464