Add contributing guidelines for awesome list

Author: simaba

CONTRIBUTING.md

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+# Contributing to Awesome AI Governance
+
+Thank you for helping maintain this curated list!
+
+## How to Add a Resource
+
+1. **Open an issue first** — describe the resource and which section it belongs in
+2. **Check for duplicates** — search the existing list before adding
+3. **Verify quality** — the resource should be:
+   - Publicly accessible (no paywalls for core content)
+   - Actively maintained or a significant historical reference
+   - Specifically relevant to AI governance, safety, or responsible AI
+4. **Fork and submit a PR** with:
+   - The resource added to the correct section in alphabetical order
+   - A one-line description (not the resource's own tagline — add context)
+   - For GitHub repos: include a stars badge
+   - PR title: `Add: [Resource Name]`
+
+## Section Guidelines
+
+| Section | What belongs here |
+|---|---|
+| Regulatory Frameworks | Official government regulations and standards |
+| Risk Management | Frameworks for assessing and managing AI risk |
+| Governance Tools | Open-source or commercial software for AI governance |
+| AI Testing | Evaluation frameworks and testing tools |
+| Incident Management | Incident databases, tracking systems, retrospectives |
+| Model Cards | Documentation standards and toolkits |
+| Academic Papers | Peer-reviewed or preprint papers (foundational or highly cited) |
+| Communities | Organizations, working groups, institutes |
+| Courses | Free or widely accessible educational resources |
+
+## What We Do NOT Include
+
+- Resources behind paywalls (except well-known ISO/IEEE standards — link to the standard page)
+- Personal blogs or opinion pieces (unless by recognized experts with significant reach)
+- Resources not specifically about AI governance or responsible AI
+- Unmaintained tools (last updated >2 years ago without a clear reason)
+
+## Code of Conduct
+
+Please follow our [Code of Conduct](https://github.com/simaba/.github/blob/main/CODE_OF_CONDUCT.md).