Create entries manually

[lalalasupa0]

Describe your suggested feature

I thought about implementing importing pdfs, but first I came up with this. Being able to create entries, as if we were importing an epub. It would simply be an empty entry where we could edit its info. And add its "chapters" manually.

Other details

Somehow I guess this already partially exists, since when you add an epub more than once, you can edit things in the second entry of that epub. BUT, adding chapters manually is still not possible.

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• [X] I have written a short but informative title.
• [X] If this is an issue with a source, I should be opening an issue in the sources repository.
• [X] I have updated the app to version 2.0.0.
• [X] I will fill out all of the requested information in this form.