ocaml-async_find: add initial version (111.28.00) to the system

pkgs/development/ocaml-modules/async_find/default.nix

@@ -0,0 +1,22 @@
+{stdenv, buildOcaml, fetchurl, async, core, sexplib}:
+
+buildOcaml rec {
+  name = "async_find";
+  version = "111.28.00";
+
+  minimumSupportedOcamlVersion = "4.02";
+
+  src = fetchurl {
+    url = "https://github.com/janestreet/async_find/archive/${version}.tar.gz";
+    sha256 = "4e3fda72f50174f05d96a5a09323f236c041b1a685890c155822956f3deb8803";
+  };
+
+  propagatedBuildInputs = [ async core sexplib ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/janestreet/async_find;
+    description = "Directory traversal with Async";
+    license = licenses.asl20;
+    maintainers = [ maintainers.ericbmerritt ];
+  };
+}