Added Download Badge

Author: openongo

README.md

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 # Odoo Mobile API (Android)
 
 [![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0)
+[ ![Download](https://api.bintray.com/packages/odooongobox/odoo-mobile-api/odoo/images/download.svg) ](https://bintray.com/odooongobox/odoo-mobile-api/odoo/_latestVersion)
 
 This project is Android Library for communicating with [Odoo](https://www.odoo.com) backend api. Main goal for this library is to provide integration support with Odoo and android native applications.