Update README.md

Author: LukePrior

README.md

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 A fork of [habitat-mobile-tracker](https://github.com/rossengeorgiev/habitat-mobile-tracker) for use with the [SondeHub v2 ElasticSearch](https://github.com/projecthorus/sondehub-infra/wiki/ElasticSearch-Kibana-access) database. Huge credits to [Rossen Georgiev](https://github.com/rossengeorgiev/) for developing the mobile-tracker.
 
+![mobile tracker screenshot](resources/mobiletracker-screencap.png "mobile tracker screenshot")
+
 A webapp for tracking radiosondes. Works an desktop and mobile devices.
 The SondeHub tracker is a continuation of [spacenear.us/tracker](http://spacenear.us/tracker).