The recommended way to install the VLC for Unity plugin is through the [Unity Store](https://assetstore.unity.com/packages/tools/video/vlc-for-unity-windows-133979). This also ensures you get commercial support with your build.
There is a quick `documentation.txt` file [included in the package](./Assets/VLC-Unity-Windows/documentation.txt). It gives some context and high level overview of how things work and how to get started.