Create an issue label guide in CONTRIBUTING.md

[RishiByte]

Create a Guide to Issue Labels and Priorities

Goal

Help new contributors understand how issue labels are used within DemonDie and make it easier to find tasks that match their experience level.

Acceptance Criteria

• Document the purpose of common label categories, including:
  • Priority labels
  • Type labels
  • Area labels
  • good first issue
  • help wanted
• Explain how contributors can identify beginner-friendly issues.
• Provide guidance on choosing an issue based on skill level and experience.
• Keep explanations concise, welcoming, and easy to understand.
• Ensure the guide is accessible to first-time open-source contributors.

Expected Outcome

New contributors should be able to quickly understand the labeling system, find suitable tasks, and begin contributing with confidence.

Additional Notes

• Focus on clarity rather than exhaustive documentation.
• Use simple language and practical examples where helpful.
• Encourage participation from contributors of all experience levels.