Add travis build status

Add the travis build status badge #2

Author: SaifJerbi

README.md

@@ -1,6 +1,7 @@
 # SF JAVA UI
 Schema Form Java based library allow developers to define schema and form using field annotations.
 
+[![Build Status](https://travis-ci.org/JsonSchema-JavaUI/sf-java-ui.svg?branch=master)](https://travis-ci.org/JsonSchema-JavaUI/sf-java-ui)
 [![Coverage Status](https://coveralls.io/repos/github/JsonSchema-JavaUI/sf-java-ui/badge.svg?branch=master)](https://coveralls.io/github/JsonSchema-JavaUI/sf-java-ui?branch=master)
 
 The SF Java UI library is a server side extension for the [Json Schema Form](https://github.com/json-schema-form) library. It make your development easier, you will not care about how to define your schema and your screen form definition. Just annotate your fields, and get your screen.