docs: add Herdr integration section to README

[eugenioenko]

Summary

• Adds a short "Herdr Integration" section to the main README with install command and link to the plugin README

Test plan

• Verify the link to herdr-plugin/README.md resolves on GitHub

🤖 Generated with Claude Code

https://claude.ai/code/session_01HNBR3GicnGcN3HBRUwpcvV

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Reviewing files that changed from the base of the PR and between 4ac5b04 and 896c680.

📒 Files selected for processing (1)

• README.md

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