feat(command): Print a success message

Inform the end-user when he/she add or remove user from a group with the
occ command.

Signed-off-by: Baptiste Fotia <fotia.baptiste@hotmail.com>

core/Command/Group/AddUser.php

@@ -67,7 +67,10 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 			$output->writeln('<error>user not found</error>');
 			return 1;
 		}
+
 		$group->addUser($user);
+		$output->writeln('<info>success</info>');
+
 		return 0;
 	}
 

core/Command/Group/RemoveUser.php

@@ -68,6 +68,9 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 			return 1;
 		}
 		$group->removeUser($user);
+
+		$output->writeln('<info>success</info>');
+
 		return 0;
 	}