I see there's a new type of server function called schema extension. Where can I read up on that?

@Pieter note that Schema extensions are still in beta - you can more about them here, too: https://www.graph.cool/forum/t/feedback-schema-extensions-beta/405?u=nilan

@nilan yeah I figured it's in beta. I just wanted to read up on it so long. I won't put it in production