Merge pull request #73 from mwilliams2014/isomorphic-doc-review

Adds Guide for Isomorphic rendering of Metal.js Components

Author: jbalsas

src/pages/docs/guides/isomorphic.md

@@ -0,0 +1,67 @@
+---
+title: "Isomorphic Rendering"
+description: "Server side rendering of Metal.js components."
+layout: "guide"
+weight: 240
+---
+
+<article id="server_rendering">
+
+## [Server Side Rendering](#server_rendering)
+
+In most cases Metal components will be rendered client side. Let's take the
+following component for example:
+
+```jsx
+import JSXComponent from 'metal-jsx';
+
+class MyComponent extends JSXComponent {
+	render() {
+		return <div>{this.props.message}</div>
+	}
+}
+
+MyComponent.PROPS = {
+	message: {
+		value: ''
+	}
+};
+
+export default MyComponent;
+```
+
+After transpiling/bundling this component, it can be invoked in client side
+JavaScript:
+
+```javascript
+const component = new metal.MyComponent({
+	message: 'Hello, World!'
+});
+
+// component.element.innerHTML === '<div>Hello, World!</div>'
+```
+
+Rendering a component this way requires DOM manipulation, and the existence of
+various global variables/utilities that are provided by web browsers. Therefore 
+there is no way to render the HTML of this component in a Node.js
+environment without the help of libraries, such as `JSDom`, that emulate client
+functionality.
+
+However, thanks to the `Component.renderToString` method, out of the box server
+side rendering of Metal components is possible in Node.js environments:
+
+```javascript
+const Component = require('metal-component').Component;
+const MyComponent = require('./MyComponent').MyComponent;
+
+const htmlString = Component.renderToString(MyComponent, {
+	message: 'Hello, World!'
+});
+
+// htmlString === '<div>Hello, World!</div>'
+```
+
+Now all of your custom Metal components can be rendered directly to HTML on the
+server.
+
+</article>