update readme for each sample app

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Nishant Srivastava
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# Using InteractiveViewer
A widget that enables pan and zoom interactions with its child.
Example app showing usage of InteractiveViewer.
The user can transform the child by dragging to pan or pinching to zoom.
InteractiveViewer is a widget that enables pan and zoom interactions with its child. The user can transform the child by dragging to pan or pinching to zoom.
Read [[Documentation](https://api.flutter.dev/flutter/widgets/InteractiveViewer-class.html)]
<img src="demo_img.gif" height="600em" />
## Getting Started
For help getting started with Flutter, view online [documentation](http://flutter.io/).
For help getting started with Flutter, view online [documentation](http://flutter.dev/).