grant all on crud.* to 'usuario'@'localhost' [with grant privileges];
flush privileges;
GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost';
FLUSH PRIVILEGES
CREATE USER 'nombre_usuario'@'localhost' IDENTIFIED BY 'tu_contrasena' [WITH GRANT OPTION];
CREATE USER 'nombre_usuario'@'%' IDENTIFIED BY 'tu_contrasena' [WITH GRANT OPTION];
GRANT ALL PRIVILEGES ON * . * TO 'nombre_usuario'@'localhost';
GRANT ALL PRIVILEGES ON * . * TO 'nombre_usuario'@'%';
FLUSH PRIVILEGES;