Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Dota2 Helper
+
+Thank you for considering contributing to **Dota2 Helper**, an Avalonia timer application with GSI integration, built using C# and .NET 8. Contributions are highly appreciated, whether they’re bug fixes, feature implementations, or documentation updates.
+
+Please follow the guidelines below to ensure smooth collaboration.
+
+---
+
+## Getting Started
+
+1. **Fork the Repository**
+   - Start by forking the repository to your GitHub account.
+
+2. **Clone Your Fork**
+   ```bash
+   git clone https://github.com/pjmagee/dota2-helper.git
+   cd dota2-helper
+   ```
+
+3. **Set Up the Project**
+   - Make sure you have the following installed:
+     - .NET SDK 8.0
+     - Avalonia UI dependencies
+   - Restore packages and build the project:
+     ```bash
+     dotnet restore
+     dotnet build
+     ```
+
+4. **Run the Application**
+   - Test the application locally to ensure it works before making changes:
+     ```bash
+     dotnet run
+     ```
+
+---
+
+## How to Contribute
+
+### 1. Follow Existing Conventions
+   - Adhere to the coding style and structure already present in the project.
+   - Follow existing patterns for naming, method usage, and folder organization.
+
+### 2. Create a Branch
+   - Always create a new branch for your work:
+     ```bash
+     git checkout -b feature/your-feature-name
+     ```
+
+### 3. Commit Changes
+   - Use descriptive commit messages.
+   - Example commit message:
+     ```
+     Add timer synchronization with GSI events
+     ```
+
+### 4. Test Your Changes
+   - Before submitting a pull request (PR), test your changes thoroughly.
+   - If you’ve added new functionality, write or update tests.
+
+### 5. Raise a Pull Request
+   - Push your branch to your fork:
+     ```bash
+     git push origin feature/your-feature-name
+     ```
+   - Open a PR to the `main` branch of this repository.
+   - In your PR description, include:
+     - A summary of the changes made
+     - Any relevant issue numbers (e.g., `Closes #123`)
+     - Testing steps, if applicable
+
+---
+
+## Code of Conduct
+
+By participating in this project, you agree to uphold our [Code of Conduct](CODE_OF_CONDUCT.md). Be respectful and inclusive in all interactions.
+
+---
+
+## Need Help?
+
+If you encounter any issues or have questions:
+- Check the [README.md](README.md) for guidance.
+- Review open issues or discussions.
+- Create a new issue if your question or bug isn’t addressed.
+
+---
+
+Thank you for your contribution!
+