feat: add Gitpod config for Docusaurus 2 (#2201)

* feat: fully automates dev setup with gitpod.

* Update .gitpod.yml

* Update README.md

Co-authored-by: Yangshun Tay <tay.yang.shun@gmail.com>

.gitpod.yml

@@ -0,0 +1,6 @@
+tasks:
+  - init: yarn install
+    command: yarn start
+ports:
+  - port: 3000
+    onOpen: open-preview

README.md

@@ -12,6 +12,7 @@
   <a href="https://discord.gg/docusaurus"><img src="https://img.shields.io/badge/chat-on%20discord-7289da.svg" alt="Chat"></a>
   <a href="https://github.com/prettier/prettier"><img alt="code style: prettier" src="https://img.shields.io/badge/code_style-prettier-ff69b4.svg"></a>
   <a href="https://github.com/facebook/jest"><img src="https://img.shields.io/badge/tested_with-jest-99424f.svg" alt="Tested with Jest"></a>
+  <a href="https://gitpod.io/#https://github.com/facebook/docusaurus"><img src="https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod" alt="Gitpod Ready-to-Code"/></a>
   <a href="https://app.netlify.com/sites/docusaurus-preview/deploys"><img src="https://api.netlify.com/api/v1/badges/57ebb454-c937-4c1d-a228-d9dccb494f49/deploy-status" alt="Netlify Status"></a>
 </p>
 
@@ -37,11 +38,17 @@ We've released Docusaurus because it helps us better scale and supports the many
 
 Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read [the full text](https://code.fb.com/codeofconduct) so that you can understand what actions will and will not be tolerated.
 
-### Contributing Guide
+### Contributing guide
 
 Read our [contributing guide](https://github.com/facebook/docusaurus/blob/master/CONTRIBUTING.md) to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to Docusaurus.
 
-### Beginner Friendly Bugs
+### Contribute online with a single click
+
+You can use Gitpod (a free, online, VS Code-based IDE) for contributing. It will launch a ready to code workspace (for Docusaurus 2) with all the dependencies installed and the development server running so that you can start contributing straight away.
+
+[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/facebook/docusaurus)
+
+### Beginner-friendly bugs
 
 To help you get your feet wet and get you familiar with our contribution process, we have a list of [beginner friendly bugs](https://github.com/facebook/docusaurus/labels/good%20first%20issue) that might contain smaller issues to tackle first. This is a great place to get started.