Add CONTRIBUTING.md file

CONTRIBUTING.md

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+# Contributing to CMD-CHAT
+
+Thank you for your interest in contributing to **cmd-chat**, a peer-to-peer, end-to-end encrypted CLI chat that leaves no logs and runs entirely in RAM! 🙌
+
+By contributing to this project, you help make secure, minimal, privacy-focused communication tools stronger for everyone.
+
+---
+
+## 🚀 What You Can Contribute
+
+We welcome contributions of all types, including:
+
+- 🐛 Bug reports and reproducible issues  
+- 💡 Feature requests and enhancements  
+- 🧪 Tests and test improvements  
+- 🛠 Code contributions / pull requests  
+- 📚 Documentation improvements  
+
+---
+
+## 📦 Getting Started
+
+1. **Fork the repository** on GitHub.
+2. **Clone your fork** locally:
+   ```bash
+   git clone https://github.com/diorwave/cmd-chat.git
+   cd cmd-chat