added additional steps

README.md

 # Dark Mute
 
-Dark Mute is python script that mutes snapcast client volume when it senses lights are off in the room.
+Dark Mute is python script that mutes snapcast client volume 
+when it senses lights are off in the room.
 
-It's written in Python 3 using a photoresistor-capacitor circuit.
+It's written in Python 3 and requires a  photoresistor-capacitor circuit 
+connected to a Raspberry Pi running Snapcast.
 
 # Setup
 
-* Create a Python 3 virtual env
-* `pip install -e` to install dependencies
-* Build rc circuit using Raspberry Pi
-* Set Sensor to GPIO Pin 7
-
+* Create and activate Python 3 virtual env
+* `pip install -e .` to install dependencies
+* Build the circuit, connected to GPIO Pin 7 
+* add user to gpio group [/dev/gpiomem] (https://raspberrypi.stackexchange.com/a/40106)