splitting the getting started page

docs/getting-started/shake.md

@@ -0,0 +1,22 @@
+# Shake
+
+You can find when someone is shaking the BBC micro:bit by checking its
+**accelerometer** (it finds whether the micro:bit is speeding up or
+slowing down).
+
+Unscramble these blocks in the editor to show a frownie when someone
+shakes the micro:bit. (Ouch!)
+
+```shuffle
+input.onGesture(Gesture.Shake, () => {
+    basic.showLeds(`
+. . . . .
+. # . # .
+. . . . .
+. # # # .
+# . . . #`);
+});
+```
+Click **Compile** to move your program to the BBC micro:bit!
+
+## [NEXT: COIN FLIPPER GAME](/getting-started/coin-flipper)