Add GitHub community files

- CONTRIBUTING.md with blueprint submission guidelines
- Issue templates for bugs and feature requests
- Pull request template

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CONTRIBUTING.md

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+# Contributing to Home Assistant Blueprints
+
+Thank you for your interest in contributing to this collection of Home Assistant blueprints!
+
+## Getting Started
+
+1. Fork the repository
+2. Clone your fork locally
+3. Create a new branch for your changes
+
+## Adding a New Blueprint
+
+1. Place your blueprint in the appropriate folder:
+   - `Common/` - General purpose blueprints
+   - `Zigbee/` - MQTT/Zigbee device blueprints
+2. Follow the existing naming conventions
+3. Include proper metadata in your blueprint (name, description, domain)
+4. Update `README.md` to list your new blueprint
+
+## Blueprint Guidelines
+
+- Use clear, descriptive names for inputs
+- Provide helpful descriptions and default values
+- Include input validation where appropriate
+- Test thoroughly before submitting
+
+## Submitting Changes
+
+1. Test your blueprint in Home Assistant
+2. Update documentation if needed
+3. Create a pull request with a clear description
+
+## Reporting Issues
+
+When reporting bugs, please include:
+
+- Home Assistant version
+- Blueprint name
+- Steps to reproduce
+- Expected vs actual behavior
+- Relevant log entries
+
+## Questions?
+
+Open an issue for any questions about contributing.