Mention CLI on Processing website

Author: toniab

content/pages/environment/index.mdx

@@ -565,3 +565,12 @@ Add contributed Examples by first opening the "Examples..." submenu from the Fil
 ## Export
 
 The [Export information and Tips](https://github.com/processing/processing/wiki/Export-Info-and-Tips) page on the Processing Wiki covers the details of exporting Applications from Java mode.
+
+## Command Line Interface (CLI) 
+
+Run sketches from the terminal using Processing's Command Line Interface (CLI).    
+To view a list of available commands, open a terminal and run:
+```
+./Processing --help
+```
+Run this command from the directory containing the Processing executable. For example, on macOS, the executable is usually located at /Applications/Processing.app/Contents/MacOS/Processing.