Update readme.

README.md

@@ -1,20 +1,57 @@
 # react-native-safe-area
-React Native module to get Safe Area Insets for iOS 11 or later.
 
-# Installation
+React Native module to retrieve safe area insets for iOS 11 or later.
+
+## Installation
 
 ```shell
 npm install --save react-native-safe-area
-react-native link
+react-native link react-native-safe-area
 ```
 
-# How to use
+## Usage
 
 ```jsx
 import SafeArea from 'react-native-safe-area'
+```
+
+If you want to use `SafeAreaInsets` type, you can import it like below:
+
+```jsx
+import SafeArea, { type SafeAreaInsets } from 'react-native-safe-area'
+```
 
+### Retrieve safe area insets for root view
+
+```jsx
 SafeArea.getSafeAreaInsetsForRootView()
   .then((result) => {
-    console.log(result) // { safeAreaInsets: { bottom: 0, top: 0, left: 0, right: 0 } }
+    console.log(result)
+    // { safeAreaInsets: { top: 44, left: 0, bottom: 34, right: 0 } }
   })
 ```
+
+### Handle safe area insets changed event
+
+```jsx
+class App extends Component<{}> {
+  // To keep the context of 'this'
+  onSafeAreaInsetsForRootViewChange = this.onSafeAreaInsetsForRootViewChange.bind(this)
+
+  componentDidMount() {
+    // Add event listener
+    SafeArea.addEventListener('safeAreaInsetsForRootViewDidChange', this.onSafeAreaInsetsForRootViewChange)
+  }
+
+  componentWillUnmount() {
+    // Remove event listener
+    SafeArea.removeEventListener('safeAreaInsetsForRootViewDidChange', this.onSafeAreaInsetsForRootViewChange)
+  }
+
+  onSafeAreaInsetsForRootViewChange(result) {
+    // Called every time that safe area insets changed
+    console.log(result)
+    // { safeAreaInsets: { top: 0, left: 44, bottom: 21, right: 44 } }
+  }
+}
+```