Initial commit, based on pxt-adafruit

docs/reference.md

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+# Reference
+
+```namespaces
+input.onGesture(Gesture.Shake, () => {})
+light.showRing('red red red red red red red red red red')
+music.playTone(0, 0)
+pins.pulseDuration()
+control.runInBackground(() => {})
+serial.writeLine("");
+```
+
+## See Also
+
+[blocks](/blocks), [JavaScript](/javascript), [input](/reference/input), [light](/reference/light), [music](/reference/music),
+[control](/reference/control), [pins](/reference/pins), [serial](/reference/serial)
+
+```package
+circuit-playground
+```