Add Delete Customer Information Module

MySQL Workbench
```
 > alter table customer add createdDate DATETIME;
 > alter table customer add isDeleted INT;

 > update customer set createdDate = now()	
 > update customer set isDeleted = 0
```
- error code 1175
  - Preferences –> Click “SQL Editor” tab and uncheck “Safe Updates” check box –> Reconnect to Server
  - Reference https://stackoverflow.com/questions/11448068/mysql-error-code-1175-during-update-in-mysql-workbench

Implement Delete customer information

CustomerDelete Component

 import React from 'react';

 class CustmerDelete extends React.Component{

     deleteCustomer(id){
         //REST API
         const url = 'api/customers/' + id;
         fetch(url, {
             method: 'DELETE'
         });
         this.props.stateRefresh();
     }

     render(){
         return(
             <button onClick={(e) => {this.deleteCustomer(this.props.id)}}>Delete</button>
         )
     }
 }

 export default CustmerDelete;

Add Customer Delete Module in the Node.js Express server

 app.delete('/api/customers/:id', (req, res) => {
 let sql = 'UPDATE customer SET isDeleted = 1 WHERE id = ?';
 let params = [req.param.id];
 connection.query (sql, params,
     (err, rows, fields) => {
     res.send(rows);
     })
 });