- Credential Management Commands:
    - Setup Credential:
      - Create .luftballon directory in the home directory
      - Store credentials in key=value format
      - Prompt user for input of username, password, and tenant name
    - Show Credential: Display stored credentials
    - Update Credential: Modify existing credentials
    - Retrieve Credential Value: Fetch a specific credential value by its key
  - Script Loading:
    - Top-Level and Credential Directory Script Sourcing:
      - driver.sh triggers the execution of credentialDriver.sh and login.sh
        - credentialDriver.sh manages credential setup, display, and update operations
        - login.sh facilitates Azure login as a service principal using credentials managed by credential functions

- Created a new function: 'auth'
- 'auth' is dedicated to the 'login' command
- Modified 'rootUsage' to direct to these new functions based on user input
- Updated help message to reflect the new command structure