Added systemd unit file for ANNIS service.
Added systemd unit file for ANNIS service.

The unit file assumes installation to /opt/annis.

amir-zeldes/ANNIS,zangsir/ANNIS,amir-zeldes/ANNIS,pixeldrama/ANNIS,pixeldrama/ANNIS,pixeldrama/ANNIS,zangsir/ANNIS,korpling/ANNIS,korpling/ANNIS,amir-zeldes/ANNIS,pixeldrama/ANNIS,zangsir/ANNIS,zangsir/ANNIS,pixeldrama/ANNIS,amir-zeldes/ANNIS,zangsir/ANNIS,korpling/ANNIS,amir-zeldes/ANNIS,amir-zeldes/ANNIS,pixeldrama/ANNIS,zangsir/ANNIS,korpling/ANNIS,korpling/ANNIS