docs: Add Code of Conduct link and EU funding logo to README

[isanmaz]

This PR adds a link to the Code of Conduct and the EU funding logo to the README.

[coderabbitai]

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[github-actions]

The latest Buf updates on your PR. Results from workflow Buf CI / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 27, 2026, 10:37 AM

[Copilot]

Pull request overview

This PR updates the repository README to improve project governance visibility and add funding attribution.

Changes:

• Adds an additional Code of Conduct link section to the README.
• Adds an EU funding logo image to the README.

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[Copilot]

README already has a "## Code of Conduct" section earlier (lines 42–45). This newly added second section duplicates the heading/link and will render as two separate CoC sections. Please consolidate by updating the existing section (or rename this new section to something else, e.g., Funding/Acknowledgements) and remove the extra blank lines.

Suggested change

	## Code of Conduct
	To facilitate a nice environment for all, check out our [Code of Conduct](https://github.com/openkcm/.github/blob/main/CODE_OF_CONDUCT.md).
	## Funding and Acknowledgements
	This project has received support as indicated by the following funding acknowledgement.

[Copilot]

The funding logo is referenced via an external hotlinked URL (apeirora.eu). This adds an availability/privacy dependency to the README rendering and could break if the remote asset changes. Consider checking the image into the repo (or hosting under a stable GitHub-controlled URL) and ensure the alt text matches the official name/acronym shown on the logo (alt says BMWE while the filename is BMWK-EU.png).

Suggested change

	<p align="center"><img alt="Bundesministerium für Wirtschaft und Energie (BMWE)-EU funding logo" src="https://apeirora.eu/assets/img/BMWK-EU.png" width="400"/></p>
	<p align="center"><img alt="Bundesministerium für Wirtschaft und Klimaschutz (BMWK) – EU funding logo" src="./BMWK-EU.png" width="400"/></p>