[Suggestion] Add new Book Info Field: DOI

Hello @mooberrydreams,

I would like to suggest you add a new book info field: DOI.

Add/edit Book → Formats and editions → DOI

A DOI (Digital Object Identifier) is a unique and never-changing string assigned to a DIGITAL document, for example, an e-book or EPUB.

Sample Format: https://doi.org/10.0000/0269881118800000

In case you like the idea, here there is additional information:
https://www.scribbr.com/citing-sources/what-is-a-doi/

Thank you very much!