Update README.md

Author: jaywcjlove

README.md

@@ -72,6 +72,7 @@ export default class Demo extends React.Component {
 - [Button](components/Button/README.md)
 - [ButtonGroup](components/ButtonGroup/README.md)
 - [Radio](components/Radio/README.md)
+- [SegmentedControl](components/SegmentedControl/README.md)
 - [Slider](components/Slider/README.md)
 - [Switch](components/Switch/README.md)