Add Snowflake semantic view skill and contributing guidelines

[MiguelElGallo]

Pull Request Checklist

• [X ] I have read and followed the CONTRIBUTING.md guidelines.
• [ X] My contribution adds a new instruction, prompt, or chat mode 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, or chat mode with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

A new skill to generate Snowflake semantics views. Also enhanced CONTRIBUTING.md for a section about Skills.

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Type of Contribution

• New instruction file.
• New prompt file.
• New chat mode file.
• New collection file.
• Update to existing instruction, prompt, chat mode, or collection.
• Other (please specify): Skill

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Additional Notes

All validations passed:

> [email protected] skill:validate
> node ./eng/validate-skills.mjs

Validating 2 skill folder(s)...

Validating snowflake-semanticview...
✅ snowflake-semanticview is valid

Validating webapp-testing...
✅ webapp-testing is valid

✅ All 2 skills are valid

🎉 Skill validation passed

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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.

[Copilot]

Pull request overview

This PR introduces a new skill for creating and validating Snowflake semantic views using the Snowflake CLI, along with enhanced documentation for contributing skills to the repository.

• Adds a comprehensive snowflake-semanticview skill with workflow, validation patterns, and CLI examples
• Enhances CONTRIBUTING.md with a dedicated "Adding Skills" section
• Updates the skills documentation table with the new skill entry

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
skills/snowflake-semanticview/SKILL.md	New skill definition with front matter, setup instructions, workflow steps, and validation requirements for Snowflake semantic views
CONTRIBUTING.md	Adds a new "Adding Skills" section with step-by-step instructions for creating, validating, and documenting skills
docs/README.skills.md	Adds table entry for the new snowflake-semanticview skill with description and bundled assets information