added class stub for HID:User service

src/core/hle/service/hid.h

@@ -0,0 +1,37 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/hle/service/service.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Namespace HID_User
+
+// This service is used for interfacing to physical user controls... perhaps "Human Interface 
+// Devices"? Uses include game pad controls, accelerometers, gyroscopes, etc.
+
+namespace HID_User {
+
+class Interface : public Service::Interface {
+public:
+
+    Interface();
+
+    ~Interface();
+
+    /**
+     * Gets the string port name used by CTROS for the service
+     * @return Port name of service
+     */
+    std::string GetPortName() const {
+        return "hid:USER";
+    }
+
+private:
+
+    DISALLOW_COPY_AND_ASSIGN(Interface);
+};
+
+} // namespace