[Feature] README Updates

[fivetran-joemarkiewicz]

Is there an existing feature request for this?

• [X] I have searched the existing issues

Describe the Feature

This packages README is not currently inline with our existing standards. It would be ideal for this repo to see README updates to be in line with our current documentation guidelines.

Describe alternatives you've considered

No response

Are you interested in contributing this feature?

• [X] Yes.
• [ ] Yes, but I will need assistance and will schedule time during your office hours for guidance.
• [ ] No.

Anything else?

During these updates, we should also add the identifier variables and ensure the integration_tests/dbt_project.yml references the identifiers as well.

[fivetran-avinash]

@fivetran-joemarkiewicz README updated, identifier variables added and merged into existing PR.