add class to material ui icon code example

Example 1: material-ui add icon to switch when on

import React from 'react';
import Switch from '@material-ui/core/Switch';
import AccountCircleIcon from '@material-ui/icons/AccountCircle';

export default function App() {
  return (
    <Switch 
    checkedIcon={<AccountCircleIcon/>}
    />
  );
}

Example 2: Material-ui account circle icon

import AccountCircleIcon from '@material-ui/icons/AccountCircle';
// don't forget to import the icon dependancy
// npm install @material Ui/icons