Update README.md

add download badge #2

Author: SaifJerbi

README.md

@@ -3,6 +3,7 @@ Schema Form Java based library allow developers to define schema and form using
 
 [![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)
+[ ![Download](https://api.bintray.com/packages/jsonschema-javaui/SF-Java-UI/sf-java-ui/images/download.svg) ](https://bintray.com/jsonschema-javaui/SF-Java-UI/sf-java-ui/_latestVersion)
 
 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.