add utils

test_display.py

@@ -564,6 +564,10 @@ def list_supported_displays():
 
 
 def main():
+    """
+    $   Main function to run display tests
+    $   python test_display.py --model epd_7_in_5_colour --test all
+    """
     """Main function to run display tests"""
     parser = argparse.ArgumentParser(description='Universal E-Paper Display Test Script')
     parser.add_argument('--model', type=str, default=None,