People ask for some resources to help get started on developing policies for apicast, including pointers to resources for the pre-requeisites such as nginx, openresty, lua.... etc.

I created this upstream issue to help developers/contributors to apicast....

https://github.com/3scale/apicast/issues/720

But I think some customer facing documentation for people who won't be contributors but who want to develop a customer policy of their own would make sense.

If this is already planned as part of some other docs or issue, then feel free to clsoe this one with a link to the other.