README: badges

Author: nim65s

README.md

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 [![License](https://img.shields.io/badge/License-BSD%202--Clause-green.svg)](https://opensource.org/licenses/BSD-2-Clause)
-[![Build Status](https://gitlab.laas.fr/stack-of-tasks/roscontrol_sot/badges/master/pipeline.svg)](http://gitlab.laas.fr/stack-of-tasks/roscontrol_sot)
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 # Introduction
 This package encapsulates a SoT graph to control a robot in the ros-control framework.