Add CODE_OF_CONDUCT and CONTRIBUTING guidelines

CONTRIBUTING.md

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+<p align="center">
+	<img src=".github/assets/atoll-logo.png" alt="Atoll logo" width="100">
+</p>
+
+# Contributing to Atoll
+
+Thank you for your interest in contributing to Atoll! We welcome contributions from everyone—developers, designers, testers, and documentation writers. Please read the following guidelines to help us maintain a collaborative and high-quality project.
+
+## Table of Contents
+- [How to Contribute](#how-to-contribute)
+- [Code of Conduct](#code-of-conduct)
+- [Development Setup](#development-setup)
+- [Pull Request Process](#pull-request-process)
+- [Coding Guidelines](#coding-guidelines)
+- [Design Contributions](#design-contributions)
+- [Documentation](#documentation)
+- [Community & Support](#community--support)
+
+---
+
+## How to Contribute
+
+1. **Fork the repository** and clone your fork locally.
+2. **Create a feature branch** for your changes: `git switch -c feature/your-feature-name`
+3. **Make your changes** following the guidelines below.
+4. **Test your changes** to ensure they work as expected and do not break existing functionality.
+5. **Commit** with clear, descriptive messages.
+6. **Push** to your fork and submit a **pull request** (PR) to the `main` branch.
+7. **Participate in code review** and address any feedback.
+
+## Code of Conduct
+
+We are committed to fostering a welcoming and inclusive environment. Please read our [Code of Conduct](CODE_OF_CONDUCT.md) before participating.
+
+## Development Setup
+
+- **Requirements:**
+	- macOS Sonoma 14.0 or later
+	- Xcode 15.0+ with Swift 5.9 toolchain
+	- MacBook with a notch (for full feature testing)
+- **Clone the repo:**
+	```bash
+	git clone https://github.com/Ebullioscopic/Atoll.git
+	cd Atoll
+	open DynamicIsland.xcodeproj
+	```
+- **Build & Run:**
+	- Select your Mac as the run destination in Xcode.
+	- Build and run (Cmd+R).
+	- Grant any requested permissions.
+
+## Pull Request Process
+
+- Ensure your branch is up to date with `main` before submitting a PR.
+- Provide a clear description of your changes and the motivation behind them.
+- Reference any related issues or discussions.
+- Add screenshots or screen recordings for UI changes.
+- Ensure the code builds without errors or warnings.
+- Respond promptly to review feedback.
+
+## Coding Guidelines
+
+- Follow Swift API Design Guidelines.
+- Use meaningful variable and function names.
+- Keep functions focused and concise.
+- Add inline documentation for public APIs and complex logic.
+- Write unit tests for new features where practical.
+- Avoid introducing unnecessary dependencies.
+
+## Design Contributions
+
+- Submit UI/UX improvements, mockups, or visual assets.
+- Maintain consistency with macOS Human Interface Guidelines.
+- Provide rationale for design decisions.
+
+## Documentation
+
+- Improve user guides, API docs, and troubleshooting sections.
+- Translate documentation into other languages.
+- Clarify setup instructions and add usage examples.
+
+## Community & Support
+
+- Join our [Discord community](https://discord.gg/zvjB4tJBkt) for discussion, support, and collaboration.
+- Be respectful and constructive in all interactions.
+
+---
+
+Thank you for helping make Atoll better!