Add contribution guidelines

Author: simaba

CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in improving this repository.
+
+## Scope
+
+This repository provides practical release readiness checklists for AI-enabled systems. Helpful contributions improve clarity, usability, and real-world usefulness.
+
+## Good contributions
+
+Examples of helpful contributions include:
+- improving checklist clarity,
+- adding realistic examples,
+- refining decision logic,
+- improving supporting documentation,
+- correcting inaccuracies.
+
+## Contribution expectations
+
+Please keep contributions:
+- concise,
+- implementation-aware,
+- easy to reuse,
+- free of proprietary or confidential material.
+
+## Pull requests
+
+When opening a pull request, explain:
+- what changed,
+- why it improves the repository,
+- and whether it affects the checklists, example configs, or CLI behavior.