Contributing added

CONTRIBUTING.md

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+# Contributing to Serilog.Sinks.XUnit.Injectable
+
+We're excited that you're interested in contributing. Before you get started, please take a moment to read through this guide to understand how you can contribute to the project.
+
+## How to Contribute
+
+1. **Create an Issue**
+   - If you have a new feature idea, a bug report, or any other improvement suggestion, start by creating an issue on the [Issues](https://github.com/soenneker/serilog.sinks.xunit.injectable/issues) page.
+   - Clearly describe the problem or enhancement you're proposing and provide as much detail as possible.
+
+2. **Fork the Repository**
+   - If you want to work on a feature or bug fix, fork the repository to your GitHub account. Click the "Fork" button at the top right corner of the repository.
+
+3. **Clone the Repository**
+   - Clone the repository to your local machine using the following command:
+     ```
+     git clone https://github.com/soenneker/serilog.sinks.xunit.injectable.git
+     ```
+
+4. **Create a Branch**
+   - Create a new branch for your contribution. Use a descriptive name that reflects the purpose of your changes.
+     ```
+     git checkout -b your-feature-branch
+     ```
+
+5. **Make Changes**
+   - Implement your changes or add new features. Be sure to follow the coding conventions and guidelines of the project.
+
+6. **Test Your Changes**
+   - Test your changes thoroughly to ensure that they work as expected.
+
+7. **Commit Changes**
+   - Commit your changes with a clear and concise commit message.
+     ```
+     git commit -m "Brief description of your changes"
+     ```
+
+8. **Push Changes**
+   - Push your changes to your forked repository on GitHub.
+     ```
+     git push origin your-feature-branch
+     ```
+
+9. **Create a Pull Request (PR)**
+   - Go to the [Pull Requests](https://github.com/soenneker/serilog.sinks.xunit.injectable/pulls) page of the original repository.
+   - Click on "New Pull Request."
+   - Select your forked repository and the branch with your changes.
+   - Provide a clear title and description for your pull request.
+   - Click "Create Pull Request."
+
+10. **Code Review**
+   - Your pull request will be reviewed by the maintainers. Be responsive to any feedback and make necessary changes.
+
+11. **Merge**
+   - Once your pull request is approved, it will be merged into the main branch.
+
+Thank you for contributing to Serilog.Sinks.XUnit.Injectable!