We already have such a post pinned on each category: e.g. Rules for VCV Rack category
If people can’t read a pinned post, there’s not much else this forum software can offer that will make them read. Feel free to look around https://meta.discourse.org/ for third-party plugins though. Perhaps there’s one that displays some sort of message on the “preview” panel on the right of the text box I’m typing this in.