Docs: Added Contributing.md

[Flashl3opard]

Summary

Add a repository-specific contributing guide for learn and align contribution instructions with the actual project stack and workflows.

Changes

Added CONTRIBUTING.md tailored to the repo:

• D1 (SQLite) database workflow
• Static HTML/Tailwind/vanilla JS frontend workflow
• Local setup with wrangler and .dev.vars
• Manual validation checklist for core user flows
• Conventional Commits and PR expectations

Summary

This PR combines documentation improvements with bug fixes addressing duplicate submissions and improving idempotency:

Documentation Changes:

• Adds CONTRIBUTING.md with comprehensive contribution guidance including:
  • Repository-specific setup instructions (Wrangler, D1 database, .dev.vars configuration)
  • Coding standards across Python, JavaScript, and HTML/Tailwind
  • Conventional Commits format and PR expectations
  • Manual validation checklist for core user flows

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📥 Commits

Reviewing files that changed from the base of the PR and between d6e1a9c and 355dc6d.

📒 Files selected for processing (1)

• CONTRIBUTING.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Copilot]

Pull request overview

Adds a repository-specific contributing guide to document local setup and contribution expectations for this Cloudflare Workers + D1 + static frontend project.

Changes:

• Introduces CONTRIBUTING.md covering prerequisites, local dev workflow (Wrangler + D1 + .dev.vars), and manual validation steps
• Documents coding standards and Conventional Commits / PR expectations

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[Flashl3opard]

Hey @A1L13N , could you please review this PR when you get a chance? thanks!