[Feature]: Document Oracle Cloud Infrastructure (OCI) backend

[anders-swanson]

Checklist

• I've searched for similar issues and couldn't find anything matching
• I've discussed this feature request in the K8sGPT Slack and got positive feedback

Is this feature request related to a problem?

No

Problem Description

n/a

Solution Description

Document configuration of the OCI backend.

Benefits

Users will be able to reference the OCI backend documentation for ease of configuration.

Potential Drawbacks

No response

Additional Information

No response