feat(docs): Update README.md (#2523)

Summary:
**Summary**

#### Changes
- [x] Added logo to the top
- [x] Aligned header elements to the center

> This change will make it look symmetrical and aligned in a proper format.

> Screenshot
![Draft JS](https://user-images.githubusercontent.com/25670841/88580007-9993d500-d068-11ea-879c-b84c4944b989.png)

Pull Request resolved: #2523

Reviewed By: elboman

Differential Revision: D22785917

Pulled By: mrkev

fbshipit-source-id: 06fe02430aadea761f30adb6a01218b732d818af

Author: iamdarshshah

README.md

@@ -1,6 +1,24 @@
-# [Draft.js](http://draftjs.org/) [![Build Status](https://img.shields.io/travis/facebook/draft-js/master.svg?style=flat)](https://travis-ci.org/facebook/draft-js) [![npm version](https://img.shields.io/npm/v/draft-js.svg?style=flat)](https://yarn.pm/draft-js)
-
-![Live Demo](https://media.giphy.com/media/XHUjaxELpc11SiRSqN/giphy.gif)
+<p align="center">
+  <a href="http://draftjs.org/">
+    <img src="https://draftjs.org/img/draftjs-logo.svg" alt="draftjs-logo" width="8%" />
+  </a>
+</p>
+<h1 align="center">
+  Draft.js
+</h1>
+<p align="center">
+  <a href="https://travis-ci.org/facebook/draft-js">
+    <img src="https://img.shields.io/travis/facebook/draft-js/master.svg?style=flat" alt="Build Status" />
+  </a>
+  <a href="https://yarn.pm/draft-js">
+    <img src="https://img.shields.io/npm/v/draft-js.svg?style=flat" alt="npm version" />
+  </a>
+</p>
+<p align="center">
+  <img src="https://media.giphy.com/media/XHUjaxELpc11SiRSqN/giphy.gif" alt="Live Demo" />
+</p>
+
+--------------------
 
 Draft.js is a JavaScript rich text editor framework, built for React and
 backed by an immutable model.