Add CONTRIBUTING guide

Author: zoontek

CONTRIBUTING.md

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+# Contributing to react-native-edge-to-edge
+
+Thank you for your interest in contributing to **react-native-edge-to-edge**! We appreciate your help in improving this project. Please follow the guidelines below to ensure a smooth contribution process.
+
+## Code of conduct
+
+This project and everyone participating in it is governed by the [Code of conduct](.github/CODE_OF_CONDUCT.md). By participating, you are expected to adhere to this code.
+
+## How can I contribute?
+
+### Reporting bugs
+
+If you encounter any bugs or issues, please report them via [GitHub issues](https://github.com/zoontek/react-native-edge-to-edge/issues). When submitting a bug report, please ensure that you follow the provided template.
+
+### Suggesting features
+
+We are open to discussion! If you have a feature request, please submit it via [GitHub issues](https://github.com/zoontek/react-native-edge-to-edge/issues).
+
+### Contributing code
+
+We welcome pull requests! Here’s how you can contribute:
+
+1. Fork the repository and clone your fork.
+2. Create a new branch for your feature or bugfix: `git checkout -b feature/a-name`
+3. Write clear and concise code, following the coding guidelines (enforced by [`prettier`](https://prettier.io/)).
+4. Test your code using the [example app](./example) on both iOS and Android, and on both React Native architectures.
+5. Commit your changes and push to your fork.
+6. Open a pull request from your branch to the `main` branch of the main repository.
+
+## Development workflow
+
+### Setting up the project
+
+1. Fork the repository and clone your fork:
+
+```bash
+git clone https://github.com/zoontek/react-native-edge-to-edge.git
+```
+
+2. Install the dependencies (using [yarn v1](https://github.com/yarnpkg/yarn)):
+
+```bash
+cd react-native-edge-to-edge
+yarn install
+```
+
+3. Install the example app dependencies:
+
+```bash
+cd example
+yarn install
+
+cd ios
+bundle install && bundle exec pod install
+```
+
+4. Start the app:
+
+```bash
+yarn start
+```
+
+### Running checks
+
+We highly encourage running checks (formatting, typing, build, etc.) before committing.
+
+```bash
+yarn prepack
+```
+
+Thank you for your contributions! 🙌