Document DB management in README
Document DB management in README

This commit updates the README to document the new features now
available in this module

rharrison10/rharrison-bacula,rharrison10/rharrison-bacula,squarit/rharrison-bacula,rharrison10/rharrison-bacula,squarit/rharrison-bacula,squarit/rharrison-bacula,rharrison10/rharrison-bacula,squarit/rharrison-bacula