follow PugJs

src/playground/examples/layout.pug

@@ -0,0 +1,14 @@
+doctype html
+html(lang="en")
+  head
+    title Example
+    script.
+      if (foo) {
+        bar();
+      }
+  body
+    h1 Pug - node template engine
+    #container
+      :markdown-it
+        Pug is a _high performance_ template engine for [node](http://nodejs.org),
+        inspired by [haml](http://haml-lang.com/), and written by [TJ Holowaychuk](http://github.com/visionmedia).