Adds user creation to MySQL script

Apart from creatint the database, now the MySQL script also
creates the required user.

sql/employees.mysql.sql

 CREATE DATABASE IF NOT EXISTS `employees`;
 USE `employees`;
 
+CREATE USER IF NOT EXISTS `kata3`@`localhost` IDENTIFIED BY "kata3";
+GRANT ALL ON `employees`.* TO `kata3`@`localhost`;
+FLUSH PRIVILEGES;
+
 DROP TABLE IF EXISTS Employees;
 
 CREATE TABLE `employees`.`Employees` (