mlvpn

Hi! I'm a fresh-man with Asuswrt/Merlin, and I need run MLVPN on a RT-AC68U( https://zehome.github.io/MLVPN ). Although I have successfully built a Merlin image for my RT-AC68U, I still have no idea about adding/merging customized code into it. Is there any doc for it? Any help/hint will be...