Making codesandbox beginner friendly (codesandbox#287)

* Making repo beginner friendly

* Update README.md

Author: chakrihacker

CONTRIBUTING.md

@@ -12,6 +12,8 @@ The CodeSandbox client is currently divided in to 5 parts.
 
 This version of CodeSandbox is using the production server as source of truth, this is specified by the environment variable `LOCAL_SERVER`. It's not yet possible to sign in using this version, I haven't figured out how to handle this yet.
 
+**Working on your first Pull Request?** You can learn how from this *free* series [How to Contribute to an Open Source Project on GitHub](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github) 
+
 ## Setting Up the project locally
 
 To install the project you need to have `yarn` and `node`

README.md

@@ -1,4 +1,4 @@
-# [CodeSandbox](https://codesandbox.io) [![Chat](https://img.shields.io/badge/chat-on%20discord-7289da.svg)](https://discord.gg/KE3TbEZ) [![All Contributors](https://img.shields.io/badge/all_contributors-18-orange.svg?style=flat-square)](#contributors) [![Build Status](https://travis-ci.org/CompuIves/codesandbox-client.svg?branch=master)](https://travis-ci.org/CompuIves/codesandbox-client)
+# [CodeSandbox](https://codesandbox.io) [![Chat](https://img.shields.io/badge/chat-on%20discord-7289da.svg)](https://discord.gg/KE3TbEZ) [![All Contributors](https://img.shields.io/badge/all_contributors-18-orange.svg?style=flat-square)](#contributors) [![Build Status](https://travis-ci.org/CompuIves/codesandbox-client.svg?branch=master)](https://travis-ci.org/CompuIves/codesandbox-client) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) [![first-timers-only Friendly](https://img.shields.io/badge/first--timers--only-friendly-blue.svg)](http://www.firsttimersonly.com/)
 
 An online code editor with a focus on React.