ISS: install pd120 decoder

INSTALL.md

@@ -13,6 +13,7 @@
     - [Setup Nginx](#setup-nginx)
     - [Setup Database](#setup-database)
     - [Setup RamFS](#setup-ramfs)
+    - [Setup ISS reception and decoding (SSTV)](#setup-iss-reception-and-decoding-sstv)
     - [Cron the scheduling job](#cron-the-scheduling-job)
     - [Set your Twitter credentials](#set-your-twitter-credentials)
 
@@ -168,6 +169,16 @@ sudo mount -a
 sudo chmod 777 /var/ramfs
 ```
 
+### Setup ISS reception and decoding (SSTV)
+```
+wget -qr https://github.com/reynico/pd120_decoder/archive/master.zip -O /tmp/master.zip
+cd /tmp
+unzip master.zip
+cd pd120_decoder-master/pd120_decoder/
+pip3 install --user -r requirements.txt
+cp "{demod.py,utils.py}" "/home/pi/raspberry-noaa/"
+```
+
 ### Cron the scheduling job
 ```
 cat <(crontab -l) <(echo "1 0 * * * /home/pi/raspberry-noaa/schedule.sh") | crontab -