add some applications for sdr hardware

Author: alexmyczko

collections/software-defined-radio/index.md

@@ -11,6 +11,10 @@ items:
  - xmikos/qspectrumanalyzer
  - cjcliffe/CubicSDR
  - jopohl/urh
+ - AlbrechtL/welle.io
+ - merbanan/rtl_433
+ - fsphil/hacktv
+ - antirez/dump1090
  - https://www.youtube.com/embed/kWfU1G3Jq4w
 display_name: Software Defined Radio
 created_by: jbjonesjr