Update README.md

Author: fanghuaqi

README.md

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 # embARC Applications
+[![Build Status](https://travis-ci.org/foss-for-synopsys-dwc-arc-processors/embarc_applications.svg?branch=master)](https://travis-ci.org/foss-for-synopsys-dwc-arc-processors/embarc_applications)
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 This repository contains various applications based on embARC OSP, developed by the embARC team and the community (users, ARC licensees, students, hobbyists, etc).
 
 ## How to use it