Update README.md

README.md

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-# flutter_calculator
+# flutter calculator
 
-A new Flutter project.
+a simple flutter calculator app which using flutter material 3 color theme.
 
-## Getting Started
+<img width="300" src="https://user-images.githubusercontent.com/32636616/199989373-0ffea338-4244-48c8-828d-5472fee5da43.gif"/>   <img width="300" src="https://user-images.githubusercontent.com/32636616/199989380-9ef72953-1e11-4267-8a7e-33de3388d753.gif"/>
 
-This project is a starting point for a Flutter application.
-
-A few resources to get you started if this is your first Flutter project:
-
-- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
-- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
-
-For help getting started with Flutter development, view the
-[online documentation](https://docs.flutter.dev/), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.