📝(docs) add CONTRIBUTING.md doc

CHANGELOG.md

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 ## [Unreleased]
 
+## Added
+
+- 📝Contributing.md #352
+
 
 ## [1.6.0] - 2024-10-17
 

CONTRIBUTING.md

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+# Contributing to the Project
+
+Thank you for taking the time to contribute! Please follow these guidelines to ensure a smooth and productive workflow. 🚀🚀🚀
+
+To get started with the project, please refer to the [README.md](https://github.com/numerique-gouv/impress/blob/main/README.md) for detailed instructions.
+
+## Creating an Issue
+
+When creating an issue, please provide the following details:
+
+1.  **Title**: A concise and descriptive title for the issue.
+2.  **Description**: A detailed explanation of the issue, including relevant context or screenshots if applicable.
+3.  **Steps to Reproduce**: If the issue is a bug, include the steps needed to reproduce the problem.
+4.  **Expected vs. Actual Behavior**: Describe what you expected to happen and what actually happened.
+5.  **Labels**: Add appropriate labels to categorize the issue (e.g., bug, feature request, documentation).
+
+## Commit Message Format
+
+All commit messages must adhere to the following format:
+
+`<gitmoji>(type) title description`
+
+*   **<gitmoji>**: Use a gitmoji to represent the purpose of the commit. For example, ✨ for adding a new feature or 🔥 for removing something, see the list here: <https://gitmoji.dev/>.
+*   **(type)**: Describe the type of change. Common types include `backend`, `frontend`, `CI`, `docker` etc...
+*   **title**: A short, descriptive title for the change, starting with a lowercase character.
+*   **description**: Include additional details about what was changed and why.
+
+### Example Commit Message
+
+```
+✨(frontend) add user authentication logic 
+
+Implemented login and signup features, and integrated OAuth2 for social login.
+```
+
+## Pull Requests
+
+It is nice to add information about the purpose of the pull request to help reviewers understand the context and intent of the changes.
+
+Once all the required tests have passed, you can request a review from the project maintainers.
+
+## Code Style
+
+Please maintain consistency in code style. Run any linting tools available to make sure the code is clean and follows the project's conventions.
+
+## Tests
+
+Make sure that all new features or fixes have corresponding tests. Run the test suite before pushing your changes to ensure that nothing is broken.
+
+## Asking for Help
+
+If you need any help while contributing, feel free to open a discussion or ask for guidance in the issue tracker. We are more than happy to assist!
+
+Thank you for your contributions! 👍