Update README.md

README.md

 # Ebooko
 Ebook management software and synchronization to KoReader.
 
-Supports EPUB and PDF.
+Supports EPUB and PDF files.
+
+**WARNING:** This software is in early development and is not yet ready for production use. Use at your own risk.
 
 ## Install
 ```bash
@@ -35,6 +37,9 @@ python3 manage.py migrate
 python3 manage.py runserver
 ```
 
+## Contributing
+Contributions are always welcome! Fork the repo to another git service, make your changes, then drop me an email (`joe [at] radialbog9 [dot] uk`) or a discord message (`radialbog9`) so I can have a look!
+
 ## Credits
 - KoReader: https://github.com/koreader/koreader/ (AGPL 3.0)
 - KoReader Sync Server: https://github.com/koreader/koreader-sync-server/ (AGPL 3.0)