Add 'Selected Pages' as a 'Resource Type' in reading list and change Page fields for 'From-To' to just 'Pages'ages

Currently the 'Resource type' in the metadata of a resource on a reading list has chapter, article, document etc. There are many times when a list owner requests selected random pages that are not a whole chapter and it is difficult to show that. Include 'Selected Pages' as a 'Resource type' and allow 'Pages' to simply be 'Pages' rather than 'From' and 'To'. Minimising the need to input 2 fields 'from' and 'to' pages to one field 'Pages eg. 1,3,6,9,11 or 1-8 is quicker and will accommodate more varied page selections.