add README

packages/components/src/navigation/README.md

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+# Navigation
+
+Navigation is a component which renders a component which renders a heirarchy of menu items.
+
+## Usage
+
+```jsx
+import { MenuItem } from '@wordpress/components';
+import { withState } from '@wordpress/compose';
+
+const data = [
+    { title: 'My Navigation', slug: 'root', back: 'Back' },
+    { title: 'Home', slug: 'home', parent: 'root', menu: 'primary' },
+    { title: 'Option one', slug: 'option_one', parent: 'root', menu: 'primary' },
+    { title: 'Option two', slug: 'option_two', parent: 'root', menu: 'primary' },
+    { title: 'Option three', slug: 'option_three', parent: 'root', menu: 'secondary' },
+    { title: 'Child one', slug: 'child_one', parent: 'option_three', menu: 'primary' },
+    { title: 'Child two', slug: 'child_two', parent: 'option_three', menu: 'primary' },
+    { title: 'Child three', slug: 'child_three', parent: 'option_three', menu: 'primary' },
+];
+
+const MyNavigation = () => {
+    return <Navigation data={ data } initial="home" />;
+};
+```
+
+## Props
+
+Navigation supports the following props.
+
+### `data`
+
+- Type: `array`
+- Required: Yes
+
+An array of config objects for each menu item.
+
+### `initial`
+
+- Type: `string`
+- Required: Yes
+
+The active slug.