Update README.md

Author: TheMuellenator

README.md

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 ## Setting Up for Flutter Development
 
+* [Getting Started: Installing Flutter](https://flutter.dev/docs/get-started/install)
+* [Install Android Studio](https://developer.android.com/studio/)
+* [iOS Setup Instructions](https://flutter.dev/docs/get-started/install/macos#ios-setup)
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+
 ## 1. I Am Rich App
 
 * [Material Design](https://material.io/)