expressing traffic between client and server for repls

expressing-traffic.md

(-->
  ns  "user"
  op  "eval"
  session  "10299efe-8f84-4b97-814c-21eb6860223b"
  code  "(dotimes [i 3] (Thread/sleep 1000) (println (str \"==> \" i)))\n"
  file  "*cider-repl localhost*"
  line  53
  column  6
  id  "15"
)
(<--
  id  "15"
  out  "==> 0\n"
  session  "10299efe-8f84-4b97-814c-21eb6860223b"
)
(<--
  id  "15"
  out  "==> 1\n"
  session  "10299efe-8f84-4b97-814c-21eb6860223b"
)
(<--
  id  "15"
  out  "==> 2\n"
  session  "10299efe-8f84-4b97-814c-21eb6860223b"
)
(<--
  id  "15"
  ns  "user"
  session  "10299efe-8f84-4b97-814c-21eb6860223b"
  value  "nil"
)
(<--
  id  "15"
  session  "10299efe-8f84-4b97-814c-21eb6860223b"
  status  ("done")
)