[Feature Request] Adding a feature to read PDF files

[MoonMageJask]

Checklist

• This issue contains only one feature request. I will open one issue for every feature I want to request.
• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• This feature is merely an UI/UX update.
• This feature is not going to conflict with many of the existing features/options.

Is your feature request related to a problem? Please describe.

I have several files where I want to read but it is in PDF format. I love the app but I do wish it can read PDF files

Describe the solution you'd like

Implementing the ability to read PDF should be an option. Although I don't actually know how to do it because PDF are not as feature-rich as EPUB, it may conflict with the app but I don't actually know since I have never tried it.

How will you/everyone benefit from this feature?

Many people only have PDF downloads for books they like. I have several and it's a bit sad that despite the app being good, it can't really support it. A lot of us can benefit from this and I think it will be a great feature.

Additional context

No response