add BPSK demod script
Created by: cshields
Adds a script to demodulate SSB (more specifically for BPSK where we can count on a fixed frequency vs linears).
Also adds the apt script to CMakeLists.txt for satnogs/gr-satnogs#81
Created by: cshields
Adds a script to demodulate SSB (more specifically for BPSK where we can count on a fixed frequency vs linears).
Also adds the apt script to CMakeLists.txt for satnogs/gr-satnogs#81