[hpsdr] Anvelina SDR TRX forum board

[Aivars Straupe]

  I just start to maintain forum board about Anvelina SDR TRX on 
groups.io: https://groups.io/g/AnvelinaSDR
So anyone who are interested can join it or I can sent invitation, just 
inform me.

   73!                                   Aivars.YL2GVC