docs: add comprehensive CONTRIBUTING.md guide

CONTRIBUTING.md

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+# Contributing to LibrePods
+
+Thank you for your interest in contributing to LibrePods! This project aims to liberate AirPods from Apple's ecosystem, and we welcome contributions of all kinds.
+
+## Table of Contents
+
+- [Code of Conduct](#code-of-conduct)
+- [How Can I Contribute?](#how-can-i-contribute)
+- [Development Setup](#development-setup)
+- [Making Changes](#making-changes)
+- [Submitting Changes](#submitting-changes)
+- [Style Guidelines](#style-guidelines)
+- [Additional Resources](#additional-resources)
+
+## Code of Conduct
+
+This project adheres to a code of conduct. By participating, you are expected to uphold this code. Please be respectful and constructive in all interactions.
+
+## How Can I Contribute?
+
+### Reporting Bugs
+
+Before creating bug reports, please check existing issues. When creating a bug report, include:
+
+- **Device Information**: Phone model, OS version, AirPods model
+- **LibrePods Version**: Found in app settings
+- **Root Status** (Android): LSPosed version if applicable
+- **Steps to Reproduce**: Clear, numbered steps
+- **Expected vs Actual Behavior**
+- **Logs**: Use the troubleshooting feature in the app
+
+### Suggesting Features
+
+Feature requests are welcome! Please:
+- Check if the feature has already been requested
+- Explain the use case and expected behavior
+- Consider if it aligns with the project's goals
+
+### Code Contributions
+
+All code contributions follow the standard GitHub workflow:
+1. Fork the repository
+2. Create a feature branch
+3. Make your changes
+4. Submit a pull request
+
+See [Making Changes](#making-changes) for detailed instructions.
+
+### Documentation
+
+Improvements to documentation are always welcome, including:
+- README updates
+- Protocol documentation
+- Setup guides
+- Code comments
+
+### Translations
+
+Help make LibrePods accessible to more users by contributing translations. See [Translation Guide](#translation-guide) for details.
+
+## Development Setup
+
+### Prerequisites
+
+Choose the platform you want to contribute to:
+
+#### Android Development
+
+**Requirements:**
+- Android Studio Narwhal (2025.1.x) or later
+- JDK 17+
+- Android SDK: API 35 (min) and API 36 (target)
+- Root access with Xposed Framework (LSPosed recommended)
+
+**Note**: Root is required due to an [Android Bluetooth stack limitation](https://issuetracker.google.com/issues/371713238). Exception: ColorOS/OxygenOS 16 users.
+
+#### Linux Development
+
+**Requirements:**
+- Qt 6 (base, connectivity, multimedia)
+- CMake 3.22+
+- OpenSSL development headers
+- libpulse development headers
+- C++17 compatible compiler
+
+<details>
+<summary>Installation commands for different distributions</summary>
+
+**Arch Linux / EndeavourOS:**
+```bash
+sudo pacman -S qt6-base qt6-connectivity qt6-multimedia cmake openssl libpulse
+```
+
+**Debian / Ubuntu:**
+```bash
+sudo apt-get install qt6-base-dev qt6-declarative-dev qt6-connectivity-dev \
+    qt6-multimedia-dev cmake libssl-dev libpulse-dev \
+    qml6-module-qtquick-controls qml6-module-qtquick-layouts
+```
+
+**Fedora:**
+```bash
+sudo dnf install qt6-qtbase-devel qt6-qtconnectivity-devel \
+    qt6-qtmultimedia-devel qt6-qtdeclarative-devel cmake \
+    openssl-devel pulseaudio-libs-devel
+```
+</details>
+
+### Building the Project
+
+#### Android
+
+```bash
+git clone https://github.com/YOUR_USERNAME/librepods.git
+cd librepods/android
+./gradlew assembleDebug
+adb install -r app/build/outputs/apk/debug/app-debug.apk
+```
+
+#### Linux
+
+```bash
+git clone https://github.com/YOUR_USERNAME/librepods.git
+cd librepods/linux
+mkdir build && cd build
+cmake ..
+make -j $(nproc)
+./librepods
+```
+
+For troubleshooting, see [linux/README.md](linux/README.md).
+
+## Making Changes
+
+### 1. Fork and Clone
+
+Fork the repository on GitHub, then:
+
+```bash
+git clone https://github.com/YOUR_USERNAME/librepods.git
+cd librepods
+git remote add upstream https://github.com/kavishdevar/librepods.git
+```
+
+### 2. Create a Branch
+
+```bash
+git checkout -b feat/your-feature-name
+# or
+git checkout -b fix/bug-description
+```
+
+### 3. Make Your Changes
+
+- Write clear, readable code
+- Follow the [style guidelines](#style-guidelines)
+- Add comments for complex logic
+- Update documentation if needed
+
+### 4. Test Your Changes
+
+**Android:**
+- Build and install the APK
+- Test on a physical device with AirPods
+- Verify no regressions in existing features
+
+**Linux:**
+- Build and run the application
+- Test core functionality
+- Verify system tray integration
+
+### 5. Commit Your Changes
+
+```bash
+git add .
+git commit -m "type(scope): description"
+```
+
+See [Commit Message Guidelines](#commit-messages) for format details.
+
+## Submitting Changes
+
+### Pull Request Process
+
+1. **Push to your fork:**
+   ```bash
+   git push origin your-branch-name
+   ```
+
+2. **Create a Pull Request** on GitHub with:
+   - **Clear title**: `type(scope): Brief description`
+   - **Description** including:
+     - What changed and why
+     - Related issue number (closes #123)
+     - Testing performed
+     - Screenshots for UI changes
+
+3. **Wait for review** (Note: Maintainer on hiatus until May 2026)
+
+4. **Address feedback** if requested
+
+### Pull Request Checklist
+
+- [ ] Code builds without errors
+- [ ] Tested on target platform
+- [ ] Follows style guidelines
+- [ ] Documentation updated (if applicable)
+- [ ] Commit messages follow convention
+- [ ] PR description is clear and complete
+
+## Style Guidelines
+
+### Commit Messages
+
+Follow [Conventional Commits](https://www.conventionalcommits.org/):
+
+```
+<type>(<scope>): <description>
+
+[optional body]
+
+[optional footer]
+```
+
+**Types:**
+- `feat`: New feature
+- `fix`: Bug fix
+- `docs`: Documentation changes
+- `style`: Code style changes (formatting)
+- `refactor`: Code refactoring
+- `test`: Adding tests
+- `chore`: Maintenance tasks
+
+**Examples:**
+```
+feat(android): add German translation
+fix(linux): resolve system tray detection
+docs: update development setup guide
+```
+
+### Code Style
+
+#### Kotlin (Android)
+
+- Follow [Kotlin Coding Conventions](https://kotlinlang.org/docs/coding-conventions.html)
+- 4 spaces for indentation
+- Meaningful variable and function names
+- Use `camelCase` for variables/functions, `PascalCase` for classes
+
+#### C++ (Linux)
+
+- Follow [Qt Coding Style](https://wiki.qt.io/Qt_Coding_Style)
+- Use `camelCase` for variables/functions
+- Use `PascalCase` for classes
+- Include proper header guards
+- Use C++17 features where appropriate
+
+## Additional Resources
+
+### Documentation
+
+- **Protocol Specifications**: [AAP Definitions.md](AAP%20Definitions.md)
+- **Control Commands**: [docs/control_commands.md](docs/control_commands.md)
+- **Linux Setup**: [linux/README.md](linux/README.md)
+
+### External Links
+
+- [AAP Protocol (Third-party)](https://github.com/tyalie/AAP-Protocol-Definition)
+- [Android Bluetooth Bug](https://issuetracker.google.com/issues/371713238) - Please upvote!
+
+### Community
+
+- **Discussions**: [GitHub Discussions](https://github.com/kavishdevar/librepods/discussions)
+- **Issues**: [GitHub Issues](https://github.com/kavishdevar/librepods/issues)
+
+---
+
+## Translation Guide
+
+Translations help make LibrePods accessible to users worldwide. Currently supported: 10 languages (Android), 3 languages (Linux).
+
+### Android Translations
+
+1. Create translation directory:
+   ```bash
+   mkdir -p android/app/src/main/res/values-{LANG_CODE}
+   ```
+
+2. Copy base strings file:
+   ```bash
+   cp android/app/src/main/res/values/strings.xml \
+      android/app/src/main/res/values-{LANG_CODE}/
+   ```
+
+3. Translate all `<string>` tags while preserving:
+   - Placeholders: `%1$s`, `%d`
+   - XML entities: `\'` for apostrophes
+   - Technical terms from Apple's official translations
+
+4. Test:
+   ```bash
+   cd android
+   ./gradlew assembleDebug
+   adb shell "setprop persist.sys.locale {LANG_CODE}; setprop ctl.restart zygote"
+   ```
+
+### Linux Translations
+
+1. Copy template:
+   ```bash
+   cd linux/translations
+   cp librepods_tr.ts librepods_{LANG_CODE}.ts
+   ```
+
+2. Edit with Qt Linguist (recommended) or manually:
+   ```xml
+   <message>
+       <source>English text</source>
+       <translation>Translated text</translation>
+   </message>
+   ```
+
+3. Test:
+   ```bash
+   mkdir build && cd build
+   cmake .. && make
+   LANG={LANG_CODE}.UTF-8 ./librepods
+   ```
+
+### Needed Languages
+
+High-priority: German, Japanese, Korean, Hindi, Arabic, Russian
+
+---
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the GNU GPL v3.0 License.
+
+**Thank you for contributing to LibrePods!** 🎉
+