feat(cookbook): add Copilot SDK Java Examples to community samples.

[thesurenk]

Add a web-based Java community sample to cookbook.yml under the Community Samples section, linking to "thesurenk/github-copilot-java-examples".

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• I have read and followed the Guidance for submissions involving paid services.
• My contribution adds a new instruction, prompt, agent, skill, workflow, or canvas extension file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, skill, workflow, or canvas extension with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.
• I am targeting the main branch for this pull request.

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Description

Adds a community-contributed external recipe to the Community Samples section in cookbook/cookbook.yml, following the external recipe pattern introduced in #831.

Entry details:

• ID: copilot-sdk-java-examples
• Name: Copilot SDK Java Examples
• Description: A web-based chat application built with the GitHub Copilot Java SDK, Jetty, with auth status, JSON API, chat, and CLI connectivity examples
• URL: https://github.com/thesurenk/github-copilot-java-examples
• Author: thesurenk
• Tags: java, copilot-sdk, web-app, cli, community
  This lets the project appear on the Learning Hub Cookbook page as an external community sample, alongside entries like the Node.js Agentic Issue Resolver and Copilot SDK Web App, without hosting the example code in this repository.
  Local verification:
• Ran npm run website:data and confirmed the entry appears in generated samples.json
• (Optional) Ran npm run website:dev and verified the card at /learning-hub/cookbook/

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• New agentic workflow.
• New canvas extension.
• Update to existing instruction, prompt, agent, plugin, skill, workflow, or canvas extension.
• Other (please specify): Cookbook external community sample entry in cookbook/cookbook.yml

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Additional Notes

• Only cookbook/cookbook.yml is changed.
• website/public/data/samples.json is generated at build/deploy time and should not be committed.
• Screenshot of the Cookbook page card can be added if reviewers want visual confirmation.

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[github-actions]

🟡 Contributor Reputation Check: MEDIUM risk

Check	Risk
Profile	MEDIUM
Credential audit	NONE

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[thesurenk]

@all-contributors add @thesurenk for docs

[allcontributors]

@thesurenk

I've put up a pull request to add @thesurenk! 🎉