docs(nodeplotlib): add next animation

Author: ngfelixl

img/animation-next.gif

@@ -7,6 +7,9 @@
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
 [![Gitter chat](https://badges.gitter.im/gitterHQ/gitter.png)](https://gitter.im/nodeplotlib/)
 
+
+[![Animation (View on Github)](https://raw.githubusercontent.com/ngfelixl/nodeplotlib/master/img/animation-next.gif)](https://raw.githubusercontent.com/ngfelixl/nodeplotlib/master/img/animation-next.gif)
+
 Library to create plots directly in TypeScript or JavaScript in NodeJS on top of [plotly.js](https://plot.ly/javascript/)
 without any front-end preparations. Inspired by matplotlib.