Add OWASP Cornucopia metadata

[owasp-nest]

⚠️ This PR has been generated by Arkadii Yakovets as part of the OWASP Schema initiative within OWASP Nest.

OWASP Entity Information

• Project: OWASP Cornucopia
• Repository: OWASP/www-project-cornucopia
• Metadata generated on: 2025-09-25

Changes

This PR adds the project data to comply with the OWASP Schema specification. The changes include:

• The metadata file in YAML format
• Schema validation GitHub Actions workflow

Purpose

This update ensures that the project data follows the standardized OWASP Schema format, enabling:

• Better data consistency across OWASP entities
• Improved automation and tooling capabilities
• Enhanced data validation and quality
• Streamlined integration with OWASP Nest platform

Review Guidelines

When reviewing this PR, please focus on:

1. Data Accuracy: Verify that the entity information is correct (type, level, leaders, tags)
2. Schema Compliance: Ensure all required fields are present and properly formatted
3. YAML Syntax: Check for proper YAML formatting and indentation
4. Content Quality: Review the completeness and accuracy of the data
5. GitHub Action Version: The workflow uses owasp/nest-schema/.github/actions/validate@v0 to serve the latest version. This can be changed to a specific SHA if needed.

Support & Questions

If you have any questions about this PR or the OWASP Schema implementation:

• PR Author Slack Contact: Arkadii Yakovets
• OWASP Nest Slack Channel: #project-nest
• Documentation: OWASP Schema documentation