Update README.md

Added pyShelf to Ebook software. pyShelf is still in development, however I feel it's core set of features is complete enough for most daily use. Thus far pyshelf indexes and hosts mobi, & epubs. I am currently working on PDF integration.

README.md

@@ -626,7 +626,7 @@ _Some [Content Management System](#content-management-systems-cms) and [Archivin
   - [The Epube](https://tt-rss.org/the-epube) - Self-hosted web EPUB reader using EPUB.js, Bootstrap, and Calibre. ([Source Code](https://git.tt-rss.org/fox/the-epube)) `GPL-3.0` `PHP`
 - [Komga](https://komga.org) - Media server for comics/mangas/BDs with API and OPDS support, a modern web interface for exploring your libraries, as well as a web reader. ([Source Code](https://github.com/gotson/komga)) `MIT` `Java/Docker`
 - [Mango](https://github.com/hkalexling/Mango) - Manga server and web reader with a built-in MangaDex downloader. `MIT` `Crystal`
-
+- [pyShelf](https://pyshelf.com) - Lightweight Ebook Server. ([Source Code](https://github.com/th3r00t/pyShelf)) `GPL-3.0` `Python`
 ### Enterprise-class library management software.
 
 - [Evergreen](https://evergreen-ils.org) - Highly-scalable software for libraries that helps library patrons find library materials, and helps libraries manage, catalog, and circulate those materials. ([Source Code](https://github.com/evergreen-library-system/Evergreen)) `GPL-2.0` `PL/pgSQL`