[v0.0.2] adding illustration

Author: lucdotdev

README.md

@@ -7,6 +7,8 @@
 [![Flutter Website](https://img.shields.io/badge/flutter-website-deepskyblue.svg)](https://flutter.dev/docs/development/data-and-backend/state-mgmt/options#bloc--rx)
 [![License: MIT](https://img.shields.io/badge/license-MIT-purple.svg)](https://opensource.org/licenses/MIT)
 
+<img src="docs/hover.png" alt="drawing" width="350 px"/>
+
 A flutter plugin to make payments by usehover.com ussd gateway using Android Intent and receiving the transaction information back in response. 
 **android only**