Add a CONTRIBUTING.md file

CONTRIBUTING.md

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+# Contributing to the API Platform Documentation
+
+First of all, thank you for contributing, you're awesome!
+
+To have your code integrated in the API Platform documentation project, there are some rules to follow, but don't panic, it's easy!
+
+## Reporting Bugs in the documentation
+
+Before submitting your issue:
+
+* Check if the bug is not already reported!
+* A clear title to resume the issue
+* A description of the workflow needed to reproduce the bug
+
+> [!NOTE]
+> Don't hesitate giving as much information as you can.
+
+## Code of Conduct
+
+By contributing to this project, you agree to abide by our [Code of Conduct](https://github.com/api-platform/docs#contributor-code-of-conduct). We expect all contributors to foster a welcoming and inclusive environment.
+
+## How to Contribute
+
+1. Fork this repository by clicking the "Fork" button at the top right of the `api-platform/docs` repository page.
+
+2. Clone the forked repository to your local machine:
+    ```bash
+      git clone https://github.com/your-username/repository-name.git
+    ```
+3. Create a new branch for your contribution:
+    ```bash
+      git switch -c docs-your-branch-name
+    ```
+4. Commit and push your changes
+5. Submit a Pull Request. You must decide on what branch your changes will be based depending of the nature of the change.
+   See [the dedicated documentation entry](https://api-platform.com/docs/extra/releases/).
+
+> [!TIP]
+> You can also contribute to improving the documentation directly by clicking on the
+> **"You can also help us improve the documentation of this page."** link, located at the end of each documentation page.