Create story promo list component

packages/components/psammead-story-promo-list/CHANGELOG.md

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+# Psammead Media Indicator Changelog
+
+<!-- prettier-ignore -->
+| Version | Description |
+| ------- | ----------- |
+| 0.1.0   | [PR#486](https://github.com/BBC-News/psammead/pull/486) Create initial package. |

packages/components/psammead-story-promo-list/README.md

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+# psammead-story-promo-list - [![Known Vulnerabilities](https://snyk.io/test/github/bbc/psammead/badge.svg?targetFile=packages%2Fcomponents%2Fpsammead-story-promo-list%2Fpackage.json)](https://snyk.io/test/github/bbc/psammead?targetFile=packages%2Fcomponents%2Fpsammead-story-promo-list%2Fpackage.json) [![Storybook](https://raw.githubusercontent.com/storybooks/story-promo-list/master/badge/badge-storybook.svg?sanitize=true)](https://bbc.github.io/psammead/?path=/story/story-promo-list--default) [![GitHub license](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](https://github.com/bbc/psammead/blob/latest/LICENSE) [![npm version](https://img.shields.io/npm/v/@bbc/psammead-story-promo-list.svg)](https://www.npmjs.com/package/@bbc/psammead-story-promo-list) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](https://github.com/bbc/psammead/blob/latest/CONTRIBUTING.md)
+
+## Description
+
+The `@bbc/psammead-story-promo-list` package is a set of two components, `StoryPromoUl` and `StoryPromoLi`. They use a `ul` and `li` HTML element respectively.
+
+## Installation
+
+`npm install @bbc/psammead-story-promo-list`
+
+## Props
+
+| Argument | Type | Required | Default | Example        |
+| -------- | ---- | -------- | ------- | -------------- |
+| children | node | Yes      | N/A     | `<StoryPromoLi><StoryPromo image={Image} info={Info} /></StoryPromoLi>` |
+
+## Usage
+
+Commonly used alongside [`psammead-story-promo`](https://github.com/BBC-News/psammead/tree/latest/packages/components/psammead-story-promo).
+
+```jsx
+import React, { Fragment } from 'react';
+import StoryPromo, { Headline, Summary } from '@bbc/psammead-story-promo';
+import { StoryPromoLi, StoryPromoUl } from '@bbc/psammead-story-promo-list';
+import { latin } from '@bbc/gel-foundations/scripts';
+
+const Image = (
+  <img src="https://foobar.com/image.jpg" />
+);
+
+const Info = (
+  <Fragment>
+    <Headline script={latin}>The headline of the promo</Headline>
+    <Summary script={latin}>The summary of the promo</Summary>
+    <time>12 March 2019</time>
+  </Fragment>
+);
+
+<StoryPromo
+  image={Image}
+  info={Info}
+/>
+
+<StoryPromoUl>
+  <StoryPromoLi>
+    <StoryPromo image={Image} info={Info} />;
+  </StoryPromoLi>
+  <StoryPromoLi>
+    <StoryPromo image={Image} info={Info} />;
+  </StoryPromoLi>
+</StoryPromoUl>
+
+```
+
+### When to use this component
+
+This component is designed to be used with story promos on 'index' pages.
+
+<!-- ### When not to use this component -->
+
+<!-- ### Accessibility notes -->
+
+<!-- ## Roadmap -->
+
+## Contributing
+
+Psammead is completely open source. We are grateful for any contributions, whether they be new components, bug fixes or general improvements. Please see our primary contributing guide which can be found at [the root of the Psammead respository](https://github.com/bbc/psammead/blob/latest/CONTRIBUTING.md).
+
+### [Code of Conduct](https://github.com/bbc/psammead/blob/latest/CODE_OF_CONDUCT.md)
+
+We welcome feedback and help on this work. By participating in this project, you agree to abide by the [code of conduct](https://github.com/bbc/psammead/blob/latest/CODE_OF_CONDUCT.md). Please take a moment to read it.
+
+### License
+
+Psammead is [Apache 2.0 licensed](https://github.com/bbc/psammead/blob/latest/LICENSE).