add start to ssr doc

Author: chrisvfritz

src/guide/ssr.md

@@ -4,5 +4,30 @@ type: guide
 order: 25
 ---
 
-## Introduction
+## Hello World
 
+Server-side rendering (i.e. SSR) sounds complex, but a simple node script demoing the feature requires only 3 steps:
+
+``` js
+// Step 1: Create a Vue instance
+var Vue = require('vue')
+var vm = new Vue({
+  render: function(h) {
+    return h('p', 'hello world')
+  }
+})
+
+// Step 2: Create a renderer
+var renderer = require('vue-server-renderer').createRenderer()
+
+// Step 3: Render the Vue instance to HTML
+renderer.renderToString(vm, function (error, html) {
+  if (error) throw error
+  console.log(html)
+  // => <p server-rendered="true">hello world</p>
+})
+```
+
+Not so scary, right? In the rest of this guide, we'll give you a broad overview of how SSR works with the most common use cases. Once you understand the basics, we'll share some more detailed documentation and advanced examples to help you handle any edge cases.
+
+## !!TODO: Finish this guide