Create governance document for project guidelines

Added governance principles and decision-making process.

Author: Pranav-MSK

GOVERNANCE.md

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+# Governance
+
+Commit-Art is intentionally minimal.
+
+The core principles:
+
+1. Simplicity over complexity
+2. Transparency over hidden logic
+3. Emergent behavior over enforced design
+4. GitHub-native architecture only
+
+Major gameplay changes (canvas size, decay, cooldowns) are decided by the maintainer.
+
+Community suggestions are welcome, but the project will remain focused on its core idea:
+
+Input (Issue) → Mutation (SVG) → Public Record (Commit)