Link to Appstore/GooglePlay

appstore.jsx

      let urlStore = 'iTunes Link';
      if (Platform.OS === 'android') {
        urlStore = 'Google Play Link';
      }
      Alert.alert(
        'Appstore / Google Play',
        'Linking to Store',
        [{
          text: 'OK',
          onPress: () => Linking
            .openURL(urlStore)
            .catch(err => console.error('Unexpected Error', err))
        }],
        { cancelable: false }
      );