Add release badge

to link to latest stable release tag

README.md

@@ -1,4 +1,4 @@
-# [Nextcloud](https://nextcloud.com) Android app [![Build Status](https://drone.nextcloud.com/api/badges/nextcloud/android/status.svg)](https://drone.nextcloud.com/nextcloud/android) [![Codacy Badge](https://api.codacy.com/project/badge/Grade/80401cb343854343b4d94acbfb72d3ec)](https://www.codacy.com/app/Nextcloud/android?utm_source=github.com&utm_medium=referral&utm_content=nextcloud/android&utm_campaign=Badge_Grade)
+# [Nextcloud](https://nextcloud.com) Android app [![Build Status](https://drone.nextcloud.com/api/badges/nextcloud/android/status.svg)](https://drone.nextcloud.com/nextcloud/android) [![Codacy Badge](https://api.codacy.com/project/badge/Grade/80401cb343854343b4d94acbfb72d3ec)](https://www.codacy.com/app/Nextcloud/android?utm_source=github.com&utm_medium=referral&utm_content=nextcloud/android&utm_campaign=Badge_Grade) [![Releases](https://img.shields.io/github/release/nextcloud/android.svg)](https://github.com/nextcloud/android/releases/latest)
 
 [<img src="https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png" 
       alt="Download from Google Play"