Remove DEC for solve multiple definition and add wrapper of the libra…

…ry (#1)

library.properties

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+name=ESP32 Azure IoT Arduino
+version=0.1.0
+author=Microsoft
+maintainer=Microsoft
+sentence=Azure IoT library for ESP32
+paragraph=This library provides an implementation of Azure IoT library. 
+category=Communication
+url=https://github.com/VSChina/ESP32_AzureIoT_Arduino
+architectures=esp32

src/AzureIotHub.cpp

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+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. 

src/AzureIotHub.h

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+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. 
+#ifndef __AZURE_IOTHUB_H__
+#define __AZURE_IOTHUB_H__
+
+#include "az_iot/iothub_client/inc/iothub_client.h"
+#include "az_iot/iothub_client/inc/iothub_message.h"
+#include "az_iot/c-utility/inc/azure_c_shared_utility/threadapi.h"
+#include "az_iot/c-utility/inc/azure_c_shared_utility/crt_abstractions.h"
+#include "az_iot/c-utility/inc/azure_c_shared_utility/platform.h"
+#include "az_iot/c-utility/inc/azure_c_shared_utility/xlogging.h"
+#include "az_iot/iothub_client/inc/iothubtransportmqtt.h"
+#include "az_iot/azureiotcerts.h"
+
+typedef void (*CONNECTION_STATUS_CALLBACK)(IOTHUB_CLIENT_CONNECTION_STATUS result, IOTHUB_CLIENT_CONNECTION_STATUS_REASON reason);
+typedef void (*SEND_CONFIRMATION_CALLBACK)(IOTHUB_CLIENT_CONFIRMATION_RESULT result);
+typedef void (*MESSAGE_CALLBACK)(const char* message, int length);
+typedef void (*DEVICE_TWIN_CALLBACK)(DEVICE_TWIN_UPDATE_STATE updateState, const unsigned char *payLoad, int length);
+typedef int  (*DEVICE_METHOD_CALLBACK)(const char *methodName, const unsigned char *payload, int length, unsigned char **response, int *responseLength);
+typedef void (*REPORT_CONFIRMATION_CALLBACK)(int status_code);
+#endif // __AZURE_IOTHUB_H__