Update README.md

README.md

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-# light_dark_theme_flutter
+# Flutter Light & Dark Theme.
+A simple application made with [Provider](https://pub.dev/packages/provider) and [Shared Preferences](https://pub.dev/packages/shared_preferences), where you can **change the theme** and gets applied throughout the app and also persisting the Theme, so that the application **remembers your choice** while opening next time.
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+![flutterLiteDark](https://user-images.githubusercontent.com/57340523/133626796-4f7981eb-e623-4948-abbc-c2c3323562b2.gif)
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