[Feature Request] Add metadata to book's chapters.

[uzluisf]

I read articles in my TL and I'd like to add things such the article link, published date, author, etc. I could add it to the text body but it wouldn't look good and it'd count towards the word count.

[simjanos-dev]

I was planning on adding additional information like these(except for date) for books, but not for chapters. In v0.8 there is a new website import, so I can definitely add a link field for them at least, which could be optionally displayed on the beginning of the chapter, without counting as read words.

I wouldn't be against adding these info, but I don't know where could they be displayed. For most use cases, these information could be added to the book itself: Books, Podcasts, TV Shows. Only news articles have different authors by chapter.

I think most users would not be interested in organizing a lot of books, so I want to add this feature for both books and chapters if possible, but I don't want to clutter their UI with it. I was planning on displaying them when they open a book. The most not intrusive way for chapters that comes to my mind is adding input fields for these data on the chapter editor, and displaying them at the beginning of chapters.

Do you have any thoughts or suggestions?