Deprecation notice.

Author: diagprov

README.md

@@ -1,3 +1,23 @@
+# Current Readme
+
+NOTE: this code is no longer strictly necessary and is not actively being 
+maintained. It existed briefly, because agl/ed25519 was deprecated and 
+contained Edwards-to-Montgomery conversion code that was useful. 
+
+Now:
+
+ * If you just want ed25519 signatures in Golang, that is [available in the 
+   standard library now](https://golang.org/pkg/crypto/ed25519).
+ * If you want to manipulate points on the edwards curve and in particular 
+   convert to Montgomery coordinates (the reason for this short lived fork to 
+   exist), there is a maintained library by Filippo and [a function for that](https://pkg.go.dev/filippo.io/edwards25519#Point.BytesMontgomery). 
+
+As always with crypto code you should be sure you understand what you are doing 
+and that you have read the necessary documentation and background material to 
+make sure you avoid some of the subtle bugs that may exist.
+
+# Previous Readme
+
 This repository contains two things:
 
  1. The Ed25519 code from the Golang standard library.