Update README.md

Author: markqvist

README.md

@@ -1,6 +1,6 @@
 # Lightweight Extensible Signal Transport
 
-LXST is a simple and flexible real-time streaming format and delivery protocol that allows a wide variety of implementations, while using as little bandwidth as possible. It is built on top of [Reticulum](https://reticulum.network) and offers zero-conf stream routing, end-to-end encryption and Forward Secrecy, and can be transported over any kind of medium that Reticulum supports.
+LXST is a simple and flexible real-time streaming format and delivery protocol that allows a wide variety of implementations, while using as little bandwidth as possible. It is built on top of [Reticulum](https://reticulum.network) and offers zero-conf stream routing, end-to-end encryption and Forward Secrecy, and can be transported over any kind of medium that Reticulum supports. For a user-facing client using LXST for real-time voice communication, see [Sideband](https://github.com/markqvist/Sideband).
 
 - Cross-platform, works on Linux, Android, Windows and Mac
 - Provides a variety of ready-to-use primitives, for easily creating applications such as: