chore: readme

packages/server-renderer/README.md

@@ -1 +1,16 @@
 # @vue/server-renderer
+
+``` js
+const { createSSRApp } = require('vue')
+const { renderToString } = require('@vue/server-renderer')
+
+const app = createSSRApp({
+  data: () => ({ msg: 'hello' }),
+  template: `<div>{{ msg }}</div>`
+})
+
+;(async () => {
+  const html = await renderToString(app)
+  console.log(html)
+})()
+```