(Visual Studio Code) How to add .dll/class file in my project?

Hello everyone!

I used to use Visual Studio 2017 C# to make winform projects. The projects were to connect a CNC machine by adding the “.dll” and the class file “.cs” provided by the machine’s company so that I could use its API to fetch some data I needed from the machine.

In Visual Studio, I just need to put the .dll under the path of myproject/bin/debug/ and add the header file “.cs” by right clicking the project name and “add → existing file”, then I can use those API…

However, I don’t know how to do that with VScode. I’m a newbie and just started on it. So, it’d be ok if you could explain it in details, thank you so much!