Tab 的三个首页，增加顶部图标

新建src/navigation/options/HeaderButtonsOption.js文件

import * as React from 'react';
import SimpleLineIcons from 'react-native-vector-icons/SimpleLineIcons';
import Colors from '../../constants/Colors';

const HeaderButtonsOption = navigation => {
  return {
    headerLeft: () => (
      <SimpleLineIcons
        name="bell"
        size={20}
        color={Colors.headerButton}
        onPress={() => navigation.navigate('InformationStack')}
      ...