feat: add stable hash story

.storybook/atoms.stories.js

@@ -13,7 +13,7 @@ const className = rule({
     bd: '1px solid red'
 }, 'atoms');
 
-storiesOf('Atoms', module)
+storiesOf('Addon: atoms', module)
     .add('Default', () =>
         h('div', {className}, 'Red')
     )

.storybook/stable.stories.js

@@ -0,0 +1,19 @@
+import {createElement as h} from 'react';
+import {storiesOf} from '@storybook/react';
+const {action} = require('@storybook/addon-actions');
+const {linkTo} = require('@storybook/addon-links');
+const {create} = require('../lib');
+const {addon} = require('../addon/stable');
+
+const renderer = create(h);
+addon(renderer);
+const {rule} = renderer;
+
+const className = rule({
+    bd: '1px solid red'
+}, 'atoms');
+
+storiesOf('Addon: stable hash', module)
+    .add('Default', () =>
+        h('div', {className}, 'Red')
+    )