Migrate docs from the other repo

docs/reference/led/toggle-all.md

@@ -0,0 +1,28 @@
+# Toggle All
+
+Toggle all the 25 LEDs on the [LED screen](/microbit/device/screen) - if an LED is on before the function is called, it will be off after; if an LED is off before the function is called, it will be on after.
+
+```sig
+led.toggleAll()
+```
+
+### Parameters
+
+* none
+
+### Example
+
+The following code will result in every LED being on except for the LED at coordinate (2,2)
+
+```blocks
+basic.clearScreen()
+led.plot(2, 2)
+led.toggleAll()
+```
+
+![](/static/mb/toggle-all-0.png)
+
+### See also
+
+[toggle](/microbit/reference/led/toggle), [LED screen](/microbit/device/screen), [clear screen](/microbit/reference/basic/clear-screen)
+