settings: add Quiet Mode to README.md

apps/setting/README.md

@@ -8,6 +8,7 @@ This is Bangle.js's settings menu
 * **Debug Info** should debug info be shown on the watch's screen or not?
 * **Beep** most Bangle.js do not have a speaker inside, but they can use the vibration motor to beep in different pitches. You can change the behaviour here to use a Piezo speaker if one is connected
 * **Vibration** enable/disable the vibration motor
+* **Quiet Mode** prevent notifications/alarms from vibrating/beeping/turning the screen on - see below
 * **Locale** set time zone/whether the clock is 12/24 hour (for supported clocks)
 * **Select Clock** if you have more than one clock face, select the default one
 * **HID** When Bluetooth is enabled, Bangle.js can appear as a Bluetooth Keyboard/Joystick/etc to send keypresses to a connected device.
@@ -31,3 +32,17 @@ This is Bangle.js's settings menu
 * **LCD Timeout** how long should the LCD stay on for if no activity is detected. 0=stay on forever
 * **Wake on X** should the given activity wake up the Bangle.js LCD?
 * **Twist X** these options adjust the sensitivity of `Wake on Twist` to ensure Bangle.js wakes up with just the right amount of wrist movement.
+
+
+## Quiet Mode
+
+Quiet Mode is a hint to apps and widgets that you do not want to be disturbed.   
+The exact effects depend on the app.  In general the watch will not wake up by itself, but will still respond to button presses.
+
+* **Quiet Mode**
+  - Off: Normal operation
+  - Alarms: Stops notifications, but "alarm" apps will still work
+  - Silent: Blocks even alarms
+* **LCD Brightness**, **LCD Timeout**, **Wake on X**:
+  Override default settings while Quit Mode is active (either as *Alarms* or *Silent*)
+