New Governance Metric - OSC Governance/Security TWG

Per the Security TWG: Please update/add Security.md

Please refer to: https://github.com/IntersectMBO/Open-Source-Office/blob/main/SECURITY.md

The initial deadline for these changes to be made is 30 September 2024. Thank you.

Ref: #44

Start by checking whether Security.md exists in the repository, then compare it with the referenced Open-Source-Office SECURITY.md and review issue #44 for context. Done means Security.md has been updated or added to reflect the requested OSC Governance/Security TWG metric changes.

Written by the indexing model from the issue text.