feature request: uploading using [OPDS](https://specs.opds.io/) feeds' metadata cf. [upload using OPDS feed? (self.libgen)](https://old.reddit.com/r/libgen/comments/mwb0xb/upload_using_opds_feed/)
feature request: uploading using OPDS feeds' metadata
cf. upload using OPDS feed? (self.libgen)