Update playgroud screen

Author: ethanshar

demo/src/screens/PlaygroundScreen.tsx

@@ -1,20 +1,26 @@
 import _ from 'lodash';
 import React, {Component} from 'react';
 import {StyleSheet} from 'react-native';
-import {View, Text, Card,} from 'react-native-ui-lib'; //eslint-disable-line
+import {View, Text, Card, TextField, Button} from 'react-native-ui-lib'; //eslint-disable-line
 
 export default class PlaygroundScreen extends Component {
   render() {
     return (
-      <View center bg-dark80 flex>
+      <View bg-dark80 flex padding-20>
+        <View marginT-20>
+          <TextField placeholder="Placeholder" />
+        </View>
         <Card height={100} center padding-20>
           <Text text50>Playground Screen</Text>
         </Card>
+        <View flex center>
+          <Button marginV-20 label="Button"/>
+        </View>
       </View>
     );
   }
 }
 
 const styles = StyleSheet.create({
-  container: {}
+  container: {},
 });