"README.md" did not exist on "c3ec272739dea005274664b7765846d7c3ed9229"
(hopefully) solve resource leak, coverity issue 16673, 26 April 2024; this could have been a simple 'delete' insertion, but I changed the interface of 'add' and 'scaleAndShift' to take unique_ptr. The overall interface of DigitMonitor::combine remains the same, but should be changed in the future.