Add ember-emotion as third party library

Author: Ailrun

docs/docs.yaml

@@ -43,3 +43,7 @@
     - create-emotion-styled
     - create-emotion-server
     - preact-emotion
+
+- title: Third Party Packages
+  items:
+    - ember-emotion

docs/ember-emotion.md

@@ -0,0 +1,49 @@
+# ember-emotion
+
+> Use emotion in Ember.js
+
+[![Build Status](https://travis-ci.org/alexlafroscia/ember-emotion.svg?branch=master)](https://travis-ci.org/alexlafroscia/ember-emotion)
+[![Ember Observer Score](https://emberobserver.com/badges/ember-emotion.svg)](https://emberobserver.com/addons/ember-emotion)
+[![npm version](https://badge.fury.io/js/ember-emotion.svg)](https://www.npmjs.com/package/ember-emotion)
+
+This addon
+
+- 👩‍🎤 Exposes `emotion` as a module that can be imported in Ember
+- 📦 Adds the ability to define styles scoped to a pod
+- 🚀 Supports FastBoot out-of-the-box
+- ⚡️ Allows for dynamically defining CSS values
+
+## Installation
+
+```bash
+ember install ember-emotion
+```
+
+## Usage
+
+To start using `ember-emotion`, add a `style.js` file within a `Component` or `Controller` pod. Each named export can be accessed through the `emotion-class` helper in the pod's template. The default export, for `Component` pods, is merged into the `classNames` property automatically
+
+```javascript
+// components/foo-bar/style.js
+import { css } from 'emotion';
+
+export default css`
+  background: grey;
+`;
+
+export const paragraph = css`
+  color: blue;
+`;
+```
+
+```handlebars
+{{! components/foo-bar/template.hbs }}
+The component background will be grey.
+<p class={{emotion-class 'paragraph'}}>
+  Just this text will be blue.
+</p>
+```
+
+For more information, check out the [project `README`][ember-emotion].
+
+[ember-emotion]: https://github.com/alexlafroscia/ember-emotion