updated README.md Quick Start with better mcp server guidance

[dustin-sale]

Description

Updates the Quick Start to recommend oci-cloud-mcp-server as the default OCI entry point, explain its OCI Python SDK basis, and position oci-api-mcp-server as the OCI CLI-backed alternative. Adds direct links to purpose-built server READMEs and minimal client configuration for both general OCI servers.

No dependencies are required.

Fixes # (350)

Type of change

• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• git diff --check
• Verified every added src//README.md link resolves to an existing file.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules