Add Hermes Tweet skill

[kriptoburak]

Summary

• Add Hermes Tweet to the Business & Marketing skills section.
• Link directly to the public Hermes Tweet skill folder.

Validation

• Target repo is public, non-archived, and manually curated.
• GitHub license metadata is absent; README states Apache 2.0.
• Duplicate search found no Hermes Tweet or Xquik matches in PRs or issues.
• Hermes Tweet is public, non-archived, MIT licensed, and its skill link resolves through the GitHub API.
• Official Hermes Agent docs and source locks match the current verified plugin integration surface.
• Ran git diff --check.