Update README.md

README.md

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 [![pub package](https://img.shields.io/pub/v/tab_switcher.svg)](https://pub.dartlang.org/packages/tab_switcher)
 
-Framework for building apps with fullscreen tab based UI in a way Chrome for Android is built. 
+Framework for building apps with fullscreen tab based UI in a way Chrome for Android is built.
+
+## Features
+* Gesture support
+  * Swipe header horizontally to switch between tabs
+  * Swipe header down to open tab grid
+  * Swipe minimized tab to close it
+* Tab content is captured to image when tab is minimized, background tabs do not waste resources on rebuilding
+* Uses colors specified in `MaterialApp`'s `ThemeData`
+* Customizable: replace everything with custom `Widget`
+* Comes with tab count button out of the box
+
+## Screenshot
+<img src="https://user-images.githubusercontent.com/13202642/167720635-e540360b-8f99-4f30-a47b-39493f8f7a31.png#gh-light-mode-only" width="450" align="center">
+<img src="https://user-images.githubusercontent.com/13202642/167720646-c8ca5f2e-43ca-4f9e-9d55-1074360b2069.png#gh-dark-mode-only" width="450" align="center">
+
+## Web demo
+
+TBD
+
+## Usage
+
+TBD