Updated Home (markdown)

Home.md

@@ -4,6 +4,8 @@ SDRangel uses [sample source plugins](/f4exb/sdrangel/wiki/Sample-source-plugins
 
 Conversely SDRangel uses [sample sink plugins](/f4exb/sdrangel/wiki/Sample-sink-plugins) to send I/Q samples to a hardware device. One or more [channel Tx plugins](/f4exb/sdrangel/wiki/Channel-Tx-plugins) can be used to produce modulated samples that are mixed into a transmission passband with possible subsequent interpolation before being sent to the device or written to file.
 
+You can check out the [discussion group](https://groups.io/g/sdrangel)
+
 Some pictures and videos can be found [here](/f4exb/sdrangel/wiki/SDRangel)
 
 The Main Window interface is described [here](https://github.com/f4exb/sdrangel/blob/master/sdrgui/readme.md)