Add EbookConverter

[bilec]

GitHub link: https://github.com/bilec/econverter
F-Droid link: https://f-droid.org/packages/com.econverter.app/

EbookConverter converts ebooks locally on Android. It supports EPUB, MOBI, AZW3, DOCX, FB2, HTML, TXT, and other ebook formats, with no internet connection or Calibre GUI required.

Suggested category: Document Scanner & Editor.

[offa]

Thanks for your submission. The project looks relatively new, so I'd suggest to give more time.