Mention ExifTool for reading and writing metadata#337

uschille merged 3 commits intomaindatacarpentry/image-processing:mainfrom

325-add-exiftool-in-list-of-software-that-can-help-handle-metadatadatacarpentry/image-processing:325-add-exiftool-in-list-of-software-that-can-help-handle-metadataCopy head branch name to clipboard