Update README with contact info and run instructions - #1307

PR classified as community.

⚠️ Head commit is NOT signed by a trusted team member, so the full 3-approval requirement applies. (Head commit 98408fa is signed by GitHub, not by a trusted team member. GitHub adds its own "Verified" signature to commits it creates on your behalf — e.g. edits made in the github.com web editor, suggestions applied from a review, or commits made via Codespaces or the GitHub API. That signature only proves GitHub made the commit, not that a trusted team member authored it, so it does not earn the signing credit. To get the credit, create the commit locally, and sign it with a trusted key..)

Tip: to earn the credit (−1 approval), the head commit must be signed by you with one of your own keys listed in security/trusted-signing-keys.csv. A "Verified" badge that GitHub adds to commits it creates on your behalf — web-editor edits, applied suggestions, Codespaces, API commits — does not count.

⚠️ Collaborator approvals: 0/3.

Needs 3 more collaborator approvals to merge.