Add Star-BookOrbit to the list

I would request to add Star-BookOrbit to the list under the category of "Document & PDF Viewer ."

However, this app allows to play Audio books also. It is Android companion for BookOrbit (self-hosted library management and reading platform for ebooks, PDFs, audiobooks, and comics) right.

GitHub repo: - https://github.com/Star-Trowa/StarBookOrbit