Updated README and script: Added backend login credentials and 2FA setup instructions

[YevhenZvieriev]

This PR fixed #1204 and includes updates to both the README file and the setup script:

• README:

  • Added default login credentials: username john.smith and password password123.
  • Included instructions on how to configure or disable Two-Factor Authentication (2FA).
  • Added troubleshooting steps for common login issues.

• Setup Script:

  • Added an echo statement to display the URL and default credentials for accessing the Magento backend after installation.

These changes provide clear guidance for users to access the backend easily and configure their Magento instance effectively.

[what-the-diff]

PR Summary

• Updated User Instructions in README
  We have included directions on how to access the Magento backend in the project's README.md file. This will help users easily navigate through the system.
• Enhanced Setup File
  The compose/bin/setup file has been revised. Now, it not only talks about accessing the Magento backend but also shows the default login information. This step will simplify the process of getting started with the program.