Add spec

Makefile

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+PANDOC ?= pandoc -f gfm  -H _head.html -A _foot.html -T "nREPL Protocol"
+
+index.html: spec.md _head.html _foot.html
+	$(PANDOC) -i spec.md > $@

README.md

@@ -1 +1,9 @@
 # nREPL Protocol Spec
+
+This repository contains the documentation for the nREPL protocol. In
+order to avoid breaking existing links, the top-level nrepl.org domain
+documents the original Clojure server implementation, and all the
+general cross-language details are meant to go here.
+
+Except where otherwise noted, nrepl.org is licensed under the Creative
+Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0).

_foot.html

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+<p>Except where otherwise noted, nrepl.org is licensed under the
+  <a href="https://creativecommons.org/licenses/by/4.0/">Creative
+    Commons Attribution-ShareAlike 4.0 International</a> (CC BY-SA 4.0)
+  license.</p>
+<p>© 2025 nREPL contributors |
+  <a href="https://github.com/nrepl/spec.nrepl.org">site source</a></p>

_head.html

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+  <style type="text/css">body{margin:40px auto; text-align: justify;
+     max-width:650px;line-height:1.6;font-size:18px;color:#444;padding:0
+      10px}h1,h2,h3{line-height:1.2}</style>