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CONTRIBUTING.md

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+## Introduction
+
+This document provides guidelines for contributing to the Simple Image Editor project.
+
+## How to contribute
+
+There are many ways to contribute to the Simple Image Editor project. Here are a few ideas:
+
+* **Fix bugs.** If you find a bug in the code, please report it by creating a new issue on GitHub.
+* **Add new features.** If you have an idea for a new feature, please submit a proposal by creating a new issue on GitHub.
+* **Improve the documentation.** If you find the documentation to be unclear or incomplete, please submit a pull request to make the necessary changes.
+* **Write tests.** If the code is not well-tested, please write tests to improve the code coverage.
+* **Translate the app into a new language.** If the app is not yet available in your language, please submit a pull request to add a translation.
+
+## Getting started
+
+To get started contributing to the Simple Image Editor project, please follow these steps:
+
+1. Fork the repository on GitHub.
+2. Clone the forked repository to your local machine.
+3. Install the dependencies.
+4. Create a new branch for your work.
+5. Make the changes you want to make.
+6. Write unit tests for your changes.
+7. Commit your changes to the new branch.
+8. Push the new branch to your forked repository.
+9. Create a pull request to merge your changes into the main repository.
+
+## Code style guidelines
+
+The Simple Image Editor project follows the Google Java Style Guide: https://google.github.io/styleguide/javaguide.html. Please make sure that your code follows these guidelines when submitting a pull request.
+
+## Testing guidelines
+
+The Simple Image Editor project uses JUnit for unit testing. Please write unit tests for any new code that you add.
+
+## Documentation guidelines
+
+The Simple Image Editor project uses Sphinx to generate the documentation. Please make sure that your documentation is well-written and easy to understand.
+
+## Translation guidelines
+
+The Simple Image Editor project uses Crowdin to manage translations. If you would like to translate the app into a new language, please create a new project on Crowdin and follow the instructions on the Crowdin website.
+
+## Questions?
+
+If you have any questions about contributing to the Simple Image Editor project, please feel free to ask. You can create a new issue on GitHub or send an email to the project maintainers.
+
+## Thank you!
+
+Thank you for your interest in contributing to the Simple Image Editor project. We appreciate your help in making the app better for everyone!