How to add third party libraries to the project. (Xamarin)

[Neomex via Digitalmars-d-learn]

How do I add third party libraries to the project? I am using 
Xamarin. I have built Derelict-SDL2 with dub and got the lib file 
but I don't know what to do with it.

In xamarins references folder theres only option to refresh not 
to add anything.