Add SDR role

Author: atao

README.md

@@ -17,6 +17,7 @@ You can choose what you want to install with tags :
 - ~~**multitor** : install a proxy with multiple TOR instances with load-balancing ([trimstray/multitor](https://github.com/trimstray/multitor)) → [Known issues](https://github.com/atao/raspberrypi-setup/blob/main/roles/multitor/README.md)~~
 - **proxy** : install Tor and proxy tools → [README](roles/proxy/README.md)
 - **rfid** : install RFID tools ([libnfc](https://github.com/nfc-tools/libnfc), [mfoc](https://github.com/nfc-tools/mfoc), [mfcuk](https://github.com/nfc-tools/mfcuk)) and keys from [MifareClassicTool](https://github.com/ikarus23/MifareClassicTool/tree/master/Mifare%20Classic%20Tool/app/src/main/assets/key-files) → See [Notes](roles/rfid/README.md)
+- **sdr** : install SDR tools ([rtl_433](https://github.com/merbanan/rtl_433))
 - **web** : install nginx and certbot
 - **wifi** : install Wifi and GPS tools for wardriving