add remote gpio control as an example plugin

https://github.com/meshtastic/Meshtastic-device/issues/182

src/plugins/RemoteHardwarePlugin.cpp

@@ -0,0 +1,17 @@
+#include "RemoteHardwarePlugin.h"
+#include "MeshService.h"
+#include "NodeDB.h"
+#include "RTC.h"
+#include "Router.h"
+#include "configuration.h"
+#include "main.h"
+
+RemoteHardwarePlugin remoteHardwarePlugin;
+
+bool RemoteHardwarePlugin::handleReceivedProtobuf(const MeshPacket &mp, const HardwareMessage &p)
+{
+
+    return false; // Let others look at this message also if they want
+}
+
+