Add Reading Option for double page

[Perry-God]

Describe your suggested feature

Kind of like with TachiyomiJ2K, I'd love to have the possibility to combine 2 pages.

Other details

N/A

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• I have written a short but informative title.
• If this is an issue with an official extension, I should be opening an issue in the extensions repository.
• I have updated the app to version 0.15.2.4.
• I will fill out all of the requested information in this form.

[yusing]

Agreed