how to implement a library in unity

I’m new to unity and to it’s features
I found this library or what ever it’s called in unity (AI4unity) GitHub - davidgutierrezpalma/ai4unity: A version of AForge.NET Framework that is compatible with all platforms supported by Unity3D
this one have the afroge.net library
so can someone tell me how can I implement it in unity
so I can start writing codes from the libraries in this link ?

Typically you just drop a copy of the .dll into the assets folder.

You may have trouble if it’s built for a later version of .NET then unity offers.