Update README.md

Author: nklhtv

README.md

@@ -1 +1,36 @@
 # react-native-system-ui-flags
+
+### Plugin for changing [system ui visibility](https://developer.android.com/training/system-ui/immersive.html) on Android
+
+```javascript
+import SystemUiFlags from 'react-native-system-ui-flags';
+
+const FULL_SCREEN_SYSTEM_UI_FLAGS = 0
+        | SystemUiFlags.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+        | SystemUiFlags.SYSTEM_UI_FLAG_FULLSCREEN
+        | SystemUiFlags.SYSTEM_UI_FLAG_IMMERSIVE
+        | SystemUiFlags.SYSTEM_UI_FLAG_LAYOUT_STABLE
+        | SystemUiFlags.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+        | SystemUiFlags.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
+        
+SystemUiFlags.updateSystemUiFlags(FULL_SCREEN_SYSTEM_UI_FLAGS);
+
+```
+
+```javascript
+import SystemUiFlags from 'react-native-system-ui-flags';
+
+const FULL_SCREEN_SYSTEM_UI_FLAGS = 0
+        | SystemUiFlags.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+        | SystemUiFlags.SYSTEM_UI_FLAG_FULLSCREEN
+        | SystemUiFlags.SYSTEM_UI_FLAG_IMMERSIVE
+        | SystemUiFlags.SYSTEM_UI_FLAG_LAYOUT_STABLE
+        | SystemUiFlags.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+        | SystemUiFlags.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
+        
+SystemUiFlags.getSystemUiFlags((flags) => {
+  const newFlags = flags | FULL_SCREEN_SYSTEM_UI_FLAGS;
+  SystemUiFlags.setSystemUiFlags(newFlags);
+});
+
+```