add links to metalink format

README.md

@@ -173,3 +173,15 @@ desired username for an account on this Gitea instance.
 I am currently interested in hiring a contractor skilled with the Go
 standard library interfaces to specify this tool in full and develop a
 prototype implementation.
+
+# See also
+
+## Prior art: Metalink
+
+* https://wiki.mozilla.org/Metalink
+
+* https://en.wikipedia.org/wiki/Metalink
+
+* https://datatracker.ietf.org/doc/html/rfc5854
+
+* https://www.rfc-editor.org/rfc/rfc6249.html