Add synology-api entry to README (vinta#3174)

Add an entry for synology-api to the README's list of Python libraries. The link points to N4S4/synology-api and notes it provides a Python wrapper for Synology NAS APIs (Surveillance Station, File Station, Download Station, Docker, and 50+ other endpoints).

Author: N4S4

README.md

@@ -1124,6 +1124,7 @@ _Libraries for programming with hardware._
 
 - [bleak](https://github.com/hbldh/bleak) - A cross platform Bluetooth Low Energy Client for Python using asyncio.
 - [pynput](https://github.com/moses-palmer/pynput) - A library to control and monitor input devices.
+- [synology-api](https://github.com/N4S4/synology-api) - Python wrapper for Synology NAS APIs: Surveillance Station, File Station, Download Station, Docker, and 50+ other endpoints.
 
 ### Microsoft Windows