Added extra documentation and added authcodes to user_data for easier modifications

[salsop]

Description

Added extra documentation to readme.md and added authcode= to the user_data for easier modification for people wanting to use basic bootstrapping.

Motivation and Context

Added clarity to the deployment.

How Has This Been Tested?

Deployment of template.

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

• [x ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes if appropriate.
• [ ] All new and existing tests passed.