added orientation locker

src/components/Deck.tsx

@@ -1,7 +1,11 @@
-import React, {PropsWithChildren} from 'react';
+import React, {PropsWithChildren, useEffect} from 'react';
 import {StyleSheet, View} from 'react-native';
+import Orientation from 'react-native-orientation-locker';
 
 export default function Deck(props: PropsWithChildren<{}>) {
+  useEffect(() => {
+    Orientation.lockToPortrait();
+  });
   return (
     <>
       <View style={style.view}>{props.children}</View>