docs: Update CONTRIBUTING.md

[bsbodden]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a comprehensive CONTRIBUTING.md file to the Redis OM Python project, providing detailed guidance for contributors on development setup, workflow, and project conventions. The documentation emphasizes the unique dual async/sync architecture where changes must be made to the async codebase first and then synchronized to generate the sync version.

• Adds complete contributor documentation covering setup, architecture, workflow, testing, and submission guidelines
• Updates the wordlist to include new technical terms used in the documentation

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
CONTRIBUTING.md	New comprehensive contributor guide with setup instructions, development workflow, and project-specific conventions
.github/wordlist.txt	Updates wordlist with technical terms from the new documentation

Comments suppressed due to low confidence (1)

CONTRIBUTING.md:68

• [nitpick] The emoji character '🚨' may not display properly in all environments. Consider using a text-based marker like '⚠️ WARNING:' or 'CRITICAL:' for better compatibility.

### �� Critical: Dual Async/Sync Architecture

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[abrookins]

This is great! Thanks @bsbodden.