The two C-files are just used to dynamically load the EQU8 libraries depending on architecture. If you would rather link against the modules statically you can skip this step and alter your build job accordingly
From the archive, copy the sdk/cs_bindings directory to your source-tree.
In your game client project, add cs_bindings/equ8_client/client.cs and equ8_shared.cs.
In your game server project, add cs_bindings/equ8_session_manager/session_manager.cs and equ8_shared.cs.