doc: add package deprecation notice

Following this comment thekevinbrown#80 (comment)
pierpo · Dec 24, 2021 · d84dbb2 · d84dbb2
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diff --git a/README.md b/README.md
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 # React Native Schemes Manager
 
+> ⚠️ This package is no longer necessary since `react-native` version `0.60` or above. React Native now supports the schemes correctly without any workaround.
+
 Now you can use Xcode build configurations / schemes with React Native without pulling your hair out.
 
 [![Build Status](https://travis-ci.org/thekevinbrown/react-native-schemes-manager.svg?branch=master)](https://travis-ci.org/thekevinbrown/react-native-schemes-manager)