Added stmd to benchmark

benchmark/implementations/stmd/index.js

@@ -0,0 +1,10 @@
+'use strict'
+
+var stmd = require('./stmd');
+var parser = new stmd.DocParser();
+var renderer = new stmd.HtmlRenderer();
+
+exports.run = function(data) {
+  return renderer.render(parser.parse(data));
+}
+