docs: add comprehensive CONTRIBUTING.md guide

.github/CONTRIBUTING.md

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+# Contributing to Stacks Documentation
+
+Thank you for your interest in contributing to the Stacks documentation! This repository contains comprehensive documentation about the Stacks blockchain ecosystem, including technical specifications, guides, and educational content.
+
+## Ways to Contribute
+
+### 📝 Improve Documentation
+
+- **Fix typos and grammar**: Help maintain high-quality, professional documentation
+- **Clarify explanations**: Make complex concepts easier to understand
+- **Add examples**: Include practical examples and use cases
+- **Update outdated information**: Keep documentation current with latest developments
+
+### 📋 Add New Content
+
+- **Write guides and tutorials**: Create step-by-step guides for developers
+- **Document new features**: Explain new Stacks ecosystem features and capabilities
+- **Create educational content**: Help newcomers understand Stacks concepts
+- **Translate documentation**: Make Stacks accessible to global audiences
+
+### 🔧 Technical Improvements
+
+- **Fix broken links**: Ensure all references and links work correctly
+- **Improve formatting**: Enhance readability with better markdown formatting
+- **Add diagrams and visuals**: Include helpful diagrams and illustrations
+- **Optimize structure**: Improve organization and navigation
+
+## Getting Started
+
+### 1. Choose an Issue
+
+- Check our [open issues](../../issues) for tasks that need attention
+- Look for issues labeled `documentation`, `good first issue`, or `help wanted`
+- Comment on an issue to indicate you're working on it
+
+### 2. Fork and Clone
+
+```bash
+# Fork this repository on GitHub
+# Then clone your fork
+git clone https://github.com/YOUR_USERNAME/stacks.git
+cd stacks
+
+# Set up the upstream remote
+git remote add upstream https://github.com/stacks-network/stacks.git
+```
+
+### 3. Create a Feature Branch
+
+```bash
+# Create and switch to a new branch
+git checkout -b improve-sbtc-documentation
+
+# Or for bug fixes
+git checkout -b fix-broken-link
+```
+
+### 4. Make Your Changes
+
+- Follow the existing documentation style and structure
+- Use clear, concise language appropriate for technical and non-technical audiences
+- Include proper formatting with headers, lists, and code blocks
+- Test links and ensure they work correctly
+
+### 5. Commit Your Changes
+
+```bash
+# Stage your changes
+git add .
+
+# Commit with a descriptive message
+git commit -m "docs: clarify sBTC peg-in process with step-by-step guide
+
+- Add detailed explanation of Bitcoin deposit process
+- Include visual diagram of the peg-in flow
+- Add troubleshooting section for common issues"
+```
+
+We follow [Conventional Commits](https://www.conventionalcommits.org/) format:
+- `docs:` for documentation changes
+- `feat:` for new content/features
+- `fix:` for corrections and fixes
+- `style:` for formatting improvements
+
+### 6. Submit a Pull Request
+
+```bash
+# Push your branch
+git push origin improve-sbtc-documentation
+```
+
+Then create a Pull Request:
+
+1. Go to your fork on GitHub
+2. Click "Compare & pull request"
+3. Fill in the PR details:
+   - **Title**: Clear, descriptive title following conventional commit format
+   - **Description**: Explain what you changed and why
+   - **Link issues**: Reference any related issues
+
+## Documentation Standards
+
+### Writing Style
+
+- **Audience-aware**: Write for both technical and non-technical readers
+- **Clear and concise**: Avoid jargon or explain it when necessary
+- **Active voice**: Use active voice for clarity
+- **Consistent terminology**: Use Stacks-specific terms consistently
+
+### Structure
+
+- **Logical flow**: Organize content in a logical sequence
+- **Clear headings**: Use descriptive headings and subheadings
+- **Table of contents**: Include TOC for longer documents
+- **Cross-references**: Link related documents and sections
+
+### Technical Content
+
+- **Code examples**: Include working code examples where helpful
+- **API references**: Keep API documentation up to date
+- **Version information**: Note version-specific features or changes
+- **Prerequisites**: List requirements before tutorials
+
+## Review Process
+
+1. **Automated checks**: Ensure your PR passes any automated checks
+2. **Peer review**: A maintainer will review your contribution
+3. **Feedback**: Address any requested changes
+4. **Approval**: Once approved, your PR will be merged
+
+## Recognition
+
+Contributors are recognized for their valuable work in:
+- Release notes and changelogs
+- Contributor acknowledgments
+- Community shoutouts
+
+## Code of Conduct
+
+Please adhere to our [Code of Conduct](https://github.com/stacks-network/stacks/blob/master/.github/CODE_OF_CONDUCT.md) in all interactions.
+
+## Need Help?
+
+- **Questions**: Ask in our [Discord community](https://stacks.chat/)
+- **Issues**: Report bugs or request features via [GitHub Issues](../../issues)
+- **Discussions**: Join technical discussions on [GitHub Discussions](../../discussions)
+
+Thank you for helping improve the Stacks documentation and making blockchain education more accessible! 🚀