update readme; add CGI partnership

[rudolphjacksonm]

Update README to outline CGI/Microsoft partnership

What is being addressed

Updating the README to outline the collaboration between CGI and Microsoft. CGI is to maintain TRE and work with Microsoft as partners going forward.

How is this addressed

Change to README and SUPPORT.md only. This is not a code change.

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Pull request overview

Updates the repository’s top-level documentation to reflect a change in the project’s maintenance/support model (CGI partnership), which affects how users interpret support expectations and the linked support policy.

Changes:

• Updated the “Project Status and Support” section in README.md to state the project is maintained by CGI in partnership with Microsoft.
• Adjusted the wording about support being best-effort and no guarantees on response times/roadmap.

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