integrating docs about "devices" namespace

docs/reference.md

@@ -26,11 +26,11 @@ control.inBackground(() => {
 ## Advanced
 
 ```namespaces
-bluetooth.onBluetoothConnected(() => {
-    
-});
+devices.tellCameraTo(MesCameraEvent.TakePhoto);
+bluetooth.onBluetoothConnected(() => {});
 ```
 
 ```package
+microbit-devices
 microbit-bluetooth
 ```

docs/reference/devices.md

@@ -0,0 +1,19 @@
+# Devices
+
+Control a phone with the BBC micro:bit via Bluetooth.
+
+```cards
+devices.tellCameraTo(MesCameraEvent.TakePhoto);
+devices.tellRemoteControlTo(MesRemoteControlEvent.play);
+devices.raiseAlertTo(MesAlertEvent.DisplayToast);
+devices.onNotified(MesDeviceInfo.IncomingCall, () => {
+    
+});
+devices.onGamepadButton(MesDpadButtonInfo.ADown, () => {
+    
+});
+devices.signalStrength();
+devices.onSignalStrengthChanged(() => {
+    
+});
+```

libs/microbit-bluetooth/bluetooth.cpp

@@ -2,6 +2,10 @@
 #include "MESEvents.h"
 
 using namespace pxt;
+
+/**
+ * Support for additional Bluetooth services.
+ */
 //% color=#0082FB weight=20
 namespace bluetooth {
     /**

libs/microbit-devices/devices.cpp

@@ -120,7 +120,9 @@ enum class MesDpadButtonInfo {
     _4Up = MES_DPAD_BUTTON_4_UP,
 };
 
-
+/**
+ * Control a phone with the BBC micro:bit via Bluetooth.
+ */
 //% color=156 weight=80
 namespace devices {
     static void genEvent(int id, int event) {

libs/microbit-devices/shims.d.ts

@@ -1,7 +1,9 @@
 // Auto-generated. Do not edit.
 
 
-
+    /**
+     * Control a phone with the BBC micro:bit via Bluetooth.
+     */
     //% color=156 weight=80
 declare namespace devices {