Update README.md

BorjaOuterelo · web-flow · commit 946b073e0eff · 2018-11-29T20:50:40.000+01:00
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 # Micro ROS Demo
 
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+
 ## Overview
 
 The primary purpose for this repository is to organise all packages for the [Micro-ROS project](https://microros.github.io/micro-ROS/) functionalities demonstrations.
