Update README; add guides to docs

docs/guides/rendering.md

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+# Client and Server rendering
+
+## Client-side rendering
+
+```js
+// client.js
+
+import React, { AppRegistry } from 'react-native'
+import MyApp from './MyApp'
+
+// register the app
+AppRegistry.registerApp('MyApp', () => MyApp)
+
+// mount the app within the `rootTag` and run it
+AppRegistry.runApplication('MyApp', { initialProps, rootTag: document.getElementById('react-root') })
+
+// DOM render
+React.render(<div />, document.getElementById('sidebar-app'))
+
+// Server render
+React.renderToString(<div />)
+```
+
+## Server-side rendering
+
+Pre-rendering React apps on the server is a key feature for Web applications.
+React Native for Web extends `AppRegistry` to provide support for server-side
+rendering.
+
+```js
+// server.js
+
+import React, { AppRegistry } from 'react-native'
+import MyApp from './MyApp'
+
+// register the app
+AppRegistry.registerApp('MyApp', () => MyApp)
+
+// prerender the app
+const { html, style } = AppRegistry.prerenderApplication('MyApp', { initialProps })
+
+// construct full page markup
+const HtmlShell = (html, style) => (
+  <html>
+    <head>
+      <meta charSet="utf-8" />
+      <meta content="initial-scale=1,width=device-width" name="viewport" />
+      {style}
+    </head>
+    <body>
+      <div id="react-root" dangerouslySetInnerHTML={{ __html: html }} />
+    </body>
+  </html>
+)
+
+React.renderToStaticMarkup(<HtmlShell html={html} style={style} />)
+```