The register() method takes user input for username and password, validates them to ensure only alphanumeric characters are used, and saves them in the records.txt file.
The login() method takes user input for username and password, reads the records.txt file to validate the entered credentials, and displays a success message if both the username and password are correct. If the credentials are incorrect, it displays an error message.
The main method presents the user with a menu of options to either register or login, and also provides an option to exit the program.
Note that this implementation stores the credentials in a text file, which is not a secure way to store sensitive information such as passwords. In practice, a more secure method such as hashing and salting should be used to store passwords.
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