📝 Add readme

Author: jsoendermann

.npmignore

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 node_modules
+screenshots
+
 .DS_Store
 
 # Xcode
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 *.ipa
 *.xcuserstate
 # Jetbrains
-.idea
+.idea

README.md

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+# Async Storage Dev Menu Item
+
+This module adds an item to your shaky menu that lets you see what's in your
+AsyncStorage by logging it to your (JavaScript) console as one big object.
+
+## Install
+
+Run
+
+```
+yarn add react-native-async-storage-dev-menu-item
+react-native link
+```
+
+and add `import 'react-native-async-storage-dev-menu-item'` somewhere in your
+code.
+
+## Screenshots
+
+![react-native-async-storage-dev-menu-item ios](https://github.com/jsoendermann/react-native-async-storage-dev-menu-item/raw/master/screenshots/ios.png)
+![react-native-async-storage-dev-menu-item android](https://github.com/jsoendermann/react-native-async-storage-dev-menu-item/raw/master/screenshots/android.png)