Create CONTRIBUTING.md

Author: castengine

CONTRIBUTING.md

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+# Contributing to insert-tools
+
+Thanks for your interest in contributing! We welcome all contributions — bug reports, feature suggestions, code improvements, documentation, and more.
+
+## How to Contribute
+
+### 1. Fork the Repository
+
+Click the "Fork" button in the top right corner of the [repo](https://github.com/castengine/insert-tools).
+
+### 2. Clone Your Fork
+
+```bash
+git clone https://github.com/yourusername/insert-tools.git
+cd insert-tools
+```
+
+### 3. Create a Feature Branch
+
+```bash
+git checkout -b feature/your-feature-name
+```
+
+### 4. Make Changes and Commit
+
+Make your changes, and commit them:
+
+```bash
+git add .
+git commit -m "Add a clear message about what you changed"
+```
+
+### 5. Push to GitHub
+
+```bash
+git push origin feature/your-feature-name
+```
+
+### 6. Create a Pull Request
+
+Go to your forked repository, click "New Pull Request", and follow the instructions.
+
+---
+
+## 🐛 Reporting Bugs
+
+- Use GitHub [Issues](https://github.com/castengine/insert-tools/issues)
+- Please provide steps to reproduce, expected vs actual behavior, and environment info (OS, Python version, etc.)
+
+---
+
+## 💡 Feature Suggestions
+
+Open an issue and label it with `enhancement`. Describe:
+- What problem this feature solves
+- How it should work
+
+---
+
+## 📋 Code Style
+
+- Use `black` or `isort` for formatting
+- Keep functions small and clear
+- Write docstrings and comments for clarity
+
+---
+
+## ✅ Checklist Before Submitting
+
+- [ ] Code compiles / runs without error
+- [ ] Tests pass (if applicable)
+- [ ] Includes documentation or examples (if needed)
+
+---
+
+Thank you for contributing 🙏