Visual Studio Code – Using a package from packages.config in C++ visual studio 2017

I am developing a code in C++ using as IDEE Visual Studio 2017 on my Windows 10 workstation. I need the onnxruntime library, so I have installed it by the NuGet package menager. The installation went ok and in my solution I have a folder Resource files and within it I have the file packages.config. Its content is:

   <?xml version="1.0" encoding="utf-8"?>
   <packages>
     <package id="Microsoft.ML.OnnxRuntime" version="1.12.1" targetFramework="native" />
</packages>

My main.cpp is quite simple. It is a simple hello world where I try to use the installed package. But when I compile, it gives me an error on the using Microsoft.ML.OnnxRuntime; directive. I have followed the instructions in https://learn.microsoft.com/en-us/nuget/consume-packages/overview-and-workflow.

#include <iostream>

using namespace std;
using Microsoft.ML.OnnxRuntime;

int main()
{
    cout<<"Hello worldn"

    return 0;
}