Update docs

ReadMe.md

@@ -81,6 +81,11 @@ The Integration Report must be updated after any change to device configuration
 
 To update the custom component, copy the latest files into `custom_components` directory and overwrite existing files. If you have no other custom components, you can remove the contents of the directory before copying the files.
 
+## Pico Remote Sensors
+All Pico remotes and wall keypads in the system will each get their own `sensor` in Home Assistant.
+
+The sensor's value will change when a button is pressed according to this [button map](button_map.md).
+
 ## Troubleshooting
 
 Enable debugging in your main configuration.yaml to see more logging:

button_map.md

@@ -0,0 +1,23 @@
+## Pico Wireless Control Button to Sensor Value Mapping
+
+For all models, sensor value `0` is idle state with no buttons pressed.
+
+For all models **except** PJ2-4B:
+
+Button   | Sensor Value
+-------- | ------------
+ON       | 1
+FAVORITE | 2
+OFF      | 4
+RAISE    | 8
+LOWER    | 16
+
+
+**PJ2-4B** models only:
+
+Button   | Sensor Value
+-------- | ------------
+Button 1 | 1
+Button 2 | 2
+Button 3 | 4
+Button 4 | 8