Add art on README

Author: João Pedro Evangelista

README.md

@@ -21,6 +21,18 @@ Releases
 ---
 You can grab the latest version of application on the release section of this repository.
 
+
+Screenshots
+---
+
+**Environment**
+![Environment Dashboard](https://raw.githubusercontent.com/joaoevangelista/wakatime-android-client/master/art/mobile/env_framed.png)
+**Projects**
+![Projects Dashboard](https://raw.githubusercontent.com/joaoevangelista/wakatime-android-client/master/art/mobile/projects_framed.png)
+**Leaderboard**
+![Leaderboard](https://raw.githubusercontent.com/joaoevangelista/wakatime-android-client/master/art/mobile/leaders_framed.png)
+
+
 Contributions
 ---