README: LED ring legend

README.md

@@ -65,6 +65,18 @@ In the menu: turn to move, click to select or toggle, click a number to edit it
 
 The menu closes by itself after 45 s without input.
 
+## LED ring
+
+| ring | meaning |
+| --- | --- |
+| white breathing | starting up |
+| purple breathing | waiting in the Wi-Fi setup hotspot |
+| blue dot running round | connecting to a camera |
+| teal, draining | countdown to the next camera |
+| amber, steady | paused |
+| red blinking | camera offline / insecam unreachable, skipping |
+| dim grey | menu open |
+
 ## How it works
 
 * `insecam.c` fetches one listing page (`/en/byrating/` or `/en/bynew/`, random