Create CONTRIBUTING.md

Author: Pranav-MSK

CONTRIBUTING.md

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+# Contributing to Commit-Art
+
+Commit-Art is a collaborative pixel canvas powered entirely by GitHub Issues and GitHub Actions.
+
+Every commit is a brushstroke.
+
+---
+
+## 🎨 How to Paint
+
+Create a new Issue using this exact format:
+
+Paint [A5] #FF5733
+
+Valid ranges:
+
+- Rows: A–H
+- Columns: 1–8
+- Color: 6-digit HEX code
+
+Example:
+
+Paint [C3] #00FFAA
+
+---
+
+## 📏 Rules
+
+- One pixel per issue.
+- Invalid formats are labeled `Invalid`.
+- Successful paints are labeled `Completed`.
+- Every action is permanently logged in `history.log`.
+- Do not spam or automate painting.
+
+---
+
+## 🧠 Philosophy
+
+This is a collaborative social experiment.
+
+Conflict, cooperation, and evolution are part of the system.
+
+However:
+
+- Harassment
+- Hate symbols
+- Explicit content
+- Automated abuse
+
+may be reverted or blocked.
+
+---
+
+## 🛠 Code Contributions
+
+If you'd like to improve the engine:
+
+1. Fork the repository.
+2. Create a feature branch.
+3. Submit a pull request with a clear description.
+
+Keep changes minimal and aligned with the core concept.