Add GIF and APK link (am15h#1)

* add gif

* Update README.md

Author: am15h

README.md

@@ -8,5 +8,10 @@ and [TFLite Flutter Helper Library](https://github.com/am15h/tflite_flutter_help
 * execute `install.sh`(linux) or `install.bat`(windows) for downloading tflite binaries.
 More info [here](https://github.com/am15h/tflite_flutter_plugin#important-initial-setup).
 
+## Demo 
 
+![DEMO](object_detection_demo.gif)
 
+<i>Shot on Pixel 4</i>
+
+<b>The pre-built APK can be found [here](https://drive.google.com/file/d/1QRdq28doFegBL8x7daaZ5ivwXDjslfkg/view?usp=sharing).</b>