Added 'a11y' and 'source' addons to storybook as well as more stories

stories/FieldMultiInput.stories.js

@@ -0,0 +1,28 @@
+import React from 'react';
+import {useActionState} from './helper';
+import FieldMultiInput from '../src/components/FieldMultiInput';
+import {Wrapper} from './ui';
+import {withA11y} from '@storybook/addon-a11y';
+
+export default {
+  title: 'FieldMultiInput',
+  component: FieldMultiInput,
+  decorators: [withA11y],
+};
+
+
+export const Basic = () => {
+  const options = [["FOO", "foo"], ["BAR", "bar"], ["BAZ", "baz"]];
+  const [value, setValue] = useActionState("onChange", "FOO");
+
+  return (
+    <Wrapper>
+      <FieldMultiInput
+        options={options}
+        value={value}
+        onChange={setValue}
+      />
+    </Wrapper>
+  );
+};
+