Mudnet abstracts reading and writing of network packets so that you don't have to deal with low-level buffer reading and writing.
The demo includes bonus content that demonstrates smooth snapshot interpolation with only 10 position updates per second.
This asset is targeted at developers that are familiar with (or learning about) network programming, and GML scripting. It will not teach you how to do networking.
The included documentation should be quite clear for people who understand GML scripting. Start with the "README" file.