add note re: scep server support

README.md

@@ -5,6 +5,9 @@
 
 `scep` is a Simple Certificate Enrollment Protocol server and client
 
+> [!NOTE]
+> The included SCEP server and CA is very basic and lacks critical security-related features. You are encouraged to explore a more robust solution such as [github.com/smallstep/certificates](https://github.com/smallstep/certificates). As alluded to in our [blog post](https://micromdm.io/blog/scepping-stone/) this project's SCEP server will not likely be supported in the future.
+
 ## Installation
 
 Binary releases are available on the [releases page](https://github.com/micromdm/scep/releases).