Initial proposal for branding

Change-Id: I9fffe6b1c319505cd8a6b54a84ed585151a93122
Reviewed-on: https://gerrit.libreoffice.org/39507Reviewed-by: Heiko Tietze <tietze.heiko@googlemail.com>
Tested-by: Heiko Tietze <tietze.heiko@googlemail.com>