Added Play With Docker button for interactive demo of the project

Author: flavienbwk

README.md

@@ -5,6 +5,11 @@
         <img src="https://travis-ci.org/flavienbwk/reactjs-flask-ldap-boilerplate.svg?branch=master"/>
     </a>
     <a href="https://codebeat.co/projects/github-com-flavienbwk-reactjs-flask-ldap-boilerplate-master"><img alt="codebeat badge" src="https://codebeat.co/badges/940a0bd0-5aa5-4f96-b6fc-39b6e1b7e14b" /></a>
+    <br/>
+    <br/>
+    <a href="https://labs.play-with-docker.com/?stack=https://raw.githubusercontent.com/flavienbwk/reactjs-flask-ldap-boilerplate/master/docker-compose.yml" target="_blank">
+        <img src="https://raw.githubusercontent.com/play-with-docker/stacks/master/assets/images/button.png"/>
+    </a>
 </p>
 <p align="center">ReactJS + Flask + Docker<br/>boilerplate using a token-based LDAP authentication</p>