Update README.md

README.md

@@ -1,6 +1,6 @@
 # react-native-baidu-mtj
 
-react-native wrapper for baidu-mtj sdk
+react-native wrapper for [Baidu Mobile Analytics SDK](https://mtj.baidu.com/web/sdk/index)（百度移动统计）
 
 ## Installation
 
@@ -10,12 +10,39 @@ yarn add @youjinbu/react-native-baidu-mtj
 
 ## Usage
 
+### Basic Usage
+(see [example](/example))
+
 ```js
-import BaiduMtj from "@youjinbu/react-native-baidu-mtj";
+import BaiduMtj from "@youjinbu/react-native-baidu-mtj"
+
+BaiduMtj.start('app key')
 
-// ...
+export function SomeScreen() {
+  useEffect(() => {
+    // listen to focus event
+    navigation.onFocus(() => {
+      BaiduMtj.pageStart('home')
+    })
+    return () => BaiduMtj.pageEnd('home')
+  }, [])
+
+  return <View />
+}
+```
 
-const result = await BaiduMtj.multiply(3, 7);
+### Supported Methods
+
+```typescript
+declare const Analytics: {
+    start(appKey: string, debug?: boolean): void;
+    setUserId(userId: string): void;
+    pageStart(pageName: string): void;
+    pageEnd(pageName: string): void;
+    event(eventId: string, label: string): void;
+    eventStart(eventId: string, label: string): void;
+    eventEnd(eventId: string, label: string): void;
+};
 ```
 
 ## License