add basic test

tests/unix/dune

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+
+(tests
+  (names t1)
+  (libraries nanoev nanoev.unix threads))

tests/unix/t1.expected

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+writing
+can read
+done writing

tests/unix/t1.ml

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+module E = Nanoev_unix
+
+let mkpipe () : Unix.file_descr * Unix.file_descr =
+  let f1, f2 = Unix.pipe () in
+  Unix.set_nonblock f1;
+  Unix.set_nonblock f2;
+  f1, f2
+
+let loop (e : E.t) =
+  while true do
+    E.step e
+  done
+
+let () =
+  let ev = E.create () in
+  ignore (Thread.create loop ev : Thread.t);
+  let rd, wr = mkpipe () in
+  E.on_readable ev rd () () (fun () () -> print_endline "can read");
+  Thread.delay 0.05;
+  print_endline "writing";
+  ignore
+    (Unix.write wr (Bytes.unsafe_of_string "hello") 0 (String.length "hello")
+      : int);
+  Thread.delay 0.1;
+  print_endline "done writing"