Congrats for launching!
You should really simplify the process, because right now after reading your quickstart it seems more complicated to use this compared to implementing a basic auth system inside the app
For new projects, it might seem like picking up built-in auth system is easier until you realize you have to build a model of hierarchies of organizations, groups, etc... In my experience, some of these libraries cannot even express that model despite it being the most commonly required for web apps. ShareWith implements that model for you and even handles some of the trickier corner-cases like arbitrarily nesting groups.