Updated readme

README.md

 # gdpd
 
 gdpd is a Godot add-on for loading and processing Pure Data patches.
+The audio is played using Jack on GNU/Linux and CoreAudio on OSX.
+
+
+The *master* branch is for Godot 4.X.
+Use the Godot3 branch for previous versions.
+
 
 # Using gdpd
 
+
+Install the gdpd folder in the addons folder of your Godot project.
+
+
 In a script, 
 
 1. Initialize gdpd
 
 ```python
-@onready var _gdpd = load("res://addons/gdpd/bin/gdpd.gdns").new()
+@onready var _gdpd = GdPd.new()
 ```
 
 2. Initialize the audio inputs and outputs