Add help content for using drag-and-drop to display saved FITs images
Add help content for using drag-and-drop to display saved FITs images

OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2,OpenPHDGuiding/phd2