To run this program, please type this command.
> go run .
> curl -X POST -H "Content-Type:application/json" -d "{\"name\":\"Mr.X\", \"jobName\":\"java developer\"}" http://localhost:3000/employee
> curl -X POST -H "Content-Type:application/json" -d "{\"name\":\"Mr.Y\", \"jobName\":\"golang developer\"}" http://localhost:3000/employee
> curl http://localhost:3000/employees
> curl -X PUT -H "Content-Type:application/json" -d "{\"name\":\"Mr.Y\", \"jobName\":\"senior golang developer\"}" http://localhost:3000/employee/2
> curl -X DELETE http://localhost:3000/employee/2