Create a new cdrom-image object from an image or a file, of which the contents must be a valid CD-ROM (ISO) image.
If a name is not given, the name will be derived from the given file or image name, otherwise a unique default name will be used.
The created object can be inserted into a simulated CD-ROM device using the <device>.insert command. To remove the CD-ROM medium, set the image attribute to NIL.