CLI login signup system

[Once-1296]

Description
It is a python program that when run in terminal, prompts user to select login or signup and then uses txt file handling to simulate the process.

Describe the solution you'd like

• Use match case for login signup and welcome windows
• A variable is_logged_in welcomes user if logged in or else gives choice of login/signup
• Keep program running till user chooses to break out

Additional

• Can you clear the terminal screen while switching between login signup and main windows?
• Can you store password as hashed format?