README set up added

README.md

 # Dark Mute
 
-Dark Mute is python script that mutes snapcast client volume when the 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 and capacitor.
+It's written in Python 3 using a photoresistor-capacitor circuit.
+
+# 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