Docs: Add usage instructions to screen.py

screen_control/screen.py

@@ -1,4 +1,26 @@
 
+# Screen Control Script (Kivy)
+#
+# This script displays a simple "Bonjour" message on the HDMI screen using Kivy.
+# It is designed to be run on a device without a desktop environment (headless/framebuffer).
+#
+# HOW TO RUN (CLI):
+# -----------------
+# 1. Ensure Kivy is installed (python3-kivy).
+# 2. You may need to set the DISPLAY environment variable if running from SSH or outside a graphical session:
+#    export DISPLAY=:0
+# 3. Run the script:
+#    python3 /home/aircarto/nebuleair_pro_4g/screen_control/screen.py
+#
+# HOW TO RUN (BACKGROUND):
+# ------------------------
+#    nohup python3 /home/aircarto/nebuleair_pro_4g/screen_control/screen.py > /dev/null 2>&1 &
+#
+# HOW TO STOP:
+# ------------
+#    pkill -f "screen_control/screen.py"
+#
+
 import os
 os.environ['KIVY_GL_BACKEND'] = 'gl'
 from kivy.app import App