Add screenshot

README.md

@@ -45,7 +45,7 @@
 
 ## What is this?
 
-This repo provides macOS **Virtual Audio Device** (VAD) for **streaming audio** to or from remote devices. It is part of [Roc Toolkit](https://github.com/roc-streaming/roc-toolkit) project and is interoperable with both Roc and third-party software.
+This repo provides macOS **Virtual Audio Device** (VAD) for real-time **audio streaming** to or from remote devices. It is part of [Roc Toolkit](https://github.com/roc-streaming/roc-toolkit) project and is interoperable with both Roc and third-party software.
 
 After installing Roc VAD, you can:
 
@@ -55,11 +55,11 @@ After installing Roc VAD, you can:
 
 ## How it works
 
-When you configure an app (e.g. iTunes) to use virtual device as a speaker, all sound that the app plays to the device is streamed to a remote receiver. Remote receiver could be Roc PipeWire source, or an app using Roc Toolkit library, or even a generic RTP receiver.
+When you configure your OS or individual app (e.g. VLC) to use Roc VAD output device as a speaker, all sound played to the device is streamed to a remote receiver. Remote receiver could be [PipeWire module](https://docs.pipewire.org/page_module_roc_source.html) or [PulseAudio module](https://github.com/roc-streaming/roc-pulse) running on Linux, [Roc Droid](https://github.com/roc-streaming/roc-droid) running on phone, as well as any C/Go/Java application using Roc Toolkit or generic RTP receiver.
 
-And vice versa, when you configure an app (e.g. Zoom) to use virtual device as a microphone, the sound is streamed from a remote sender to the virtual device, and the app reads the received stream.
+Similarly, when you configure OS or app (e.g. Skype) to use Roc VAD input device as a microphone, the sound streamed from remote senders to the device is passed to apps connected to the device.
 
-*TODO: screenshot*
+<img src="docs/screenshot.png" width="450px"/>
 
 Internally, Roc VAD consists of two components: