Add CONTRIBUTING.md and issue templates

Author: bysiber

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug or issue with ClearDisk
+title: "[Bug] "
+labels: bug
+assignees: ''
+---
+
+**Describe the bug**
+A clear description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce:
+1. Open ClearDisk
+2. Click on '...'
+3. See error
+
+**Expected behavior**
+What you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots.
+
+**Environment:**
+- macOS version: [e.g. 14.2]
+- ClearDisk version: [e.g. 1.6.1]
+- Install method: [DMG / Homebrew]

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Questions & Help
+    url: https://github.com/bysiber/cleardisk/discussions
+    about: Ask questions and get help from the community

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest a new feature or cache type for ClearDisk
+title: "[Feature] "
+labels: enhancement
+assignees: ''
+---
+
+**Is your feature request related to a problem?**
+A clear description of the problem. Example: "I have a lot of Gradle cache files that ClearDisk doesn't detect..."
+
+**Describe the solution you'd like**
+What you want to happen.
+
+**Cache type details (if requesting new cache support)**
+- Cache name: [e.g. Ruby gems]
+- Default location: [e.g. ~/.gem/]
+- Typical size: [e.g. 2-10 GB]
+- Safe to delete? [Yes/No/Partially]
+
+**Additional context**
+Any other context or screenshots.

CONTRIBUTING.md

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+# Contributing to ClearDisk
+
+Thank you for your interest in contributing to ClearDisk! Every contribution helps make this tool better for developers everywhere.
+
+## Ways to Contribute
+
+### Report Bugs
+- Open an [issue](https://github.com/bysiber/cleardisk/issues/new?template=bug_report.md) with steps to reproduce
+- Include your macOS version and ClearDisk version
+
+### Suggest Features
+- Open an [issue](https://github.com/bysiber/cleardisk/issues/new?template=feature_request.md) describing the feature
+- Explain the use case and how it would help developers
+
+### Add New Cache Types
+ClearDisk supports 15+ cache types. If you know of a developer cache that's missing:
+1. Fork the repo
+2. Add the cache definition in the scanner module
+3. Submit a PR with a description of the cache type and typical size
+
+### Improve Documentation
+- Fix typos, improve descriptions
+- Add translations
+- Improve the README
+
+### Code Contributions
+1. Fork the repository
+2. Create a feature branch: `git checkout -b feature/my-feature`
+3. Commit your changes: `git commit -m "Add my feature"`
+4. Push to your fork: `git push origin feature/my-feature`
+5. Open a Pull Request
+
+## Development Setup
+
+### Requirements
+- macOS 14+ (Sonoma or later)
+- Xcode 15+
+- Swift 5.9+
+
+### Build from Source
+```bash
+git clone https://github.com/bysiber/cleardisk.git
+cd cleardisk
+open ClearDisk.xcodeproj
+```
+
+Build and run with Cmd+R in Xcode.
+
+## Code Style
+- Follow Swift API Design Guidelines
+- Use SwiftUI for all new UI components
+- Keep functions small and focused
+- Add comments for non-obvious logic
+
+## Pull Request Guidelines
+- Keep PRs focused on a single change
+- Include a clear description of what changed and why
+- Test on macOS 14+ before submitting
+- Screenshots/GIFs welcome for UI changes
+
+## Questions?
+Open a [Discussion](https://github.com/bysiber/cleardisk/discussions) -- we're happy to help!