I wrote a quick how-to guide for adding simple lighting from the starting point of a project that using the orthographic camera library
The first time I added this to a game, I spent several days stuck on trying to get the render script to do everything needed. This video was a good starting point but found there is a lot of stuff to figure out yourself before its going to work as desired.
This time I am adding it to a new game and it took only a couple hours to remember how to do it, but this time I wanted to have a better guide for doing it again.