Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Telegram.Net
+
+Thank you for your interest in contributing to Telegram.Net! We welcome contributions from anyone in the community, regardless of experience level.
+
+## How to Contribute
+
+### Getting Started
+
+1. Fork the repository at [https://github.com/yawaflua/Telegram.Net](https://github.com/yawaflua/Telegram.Net)
+2. Clone your fork to your local machine
+3. Set up the development environment with the required .NET SDK
+
+### Making Changes
+
+1. Create a new branch for your feature or bug fix:
+   ```
+   git checkout -b feature/your-feature-name
+   ```
+2. Make your changes
+3. Write or update tests for the changes you made using appropriate testing frameworks (e.g., MSTest, NUnit, or xUnit)
+4. Ensure your code passes all tests and meets C# coding conventions
+
+## Code Quality Requirements
+
+### Test Coverage
+
+- **All pull requests must include tests with at least 50% code coverage**
+- Before submitting your PR, verify coverage using tools like:
+  ```
+  # Example using Coverlet and ReportGenerator
+  dotnet test /p:CollectCoverage=true /p:CoverletOutputFormat=opencover
+  dotnet tool run reportgenerator -reports:"**/coverage.opencover.xml" -targetdir:"coveragereport" -reporttypes:Html
+  ```
+
+### Coding Standards
+
+- Follow C# coding conventions and the existing style in the project
+- Use meaningful names for classes, methods, and variables
+- Include XML documentation comments for public APIs
+- Keep methods focused and reasonably sized
+
+## Pull Request Process
+
+1. Update documentation if you're changing or adding functionality
+2. Ensure your code has adequate test coverage (minimum 50%)
+3. Submit your pull request with a clear title and description
+4. Reference any relevant issues in your PR description
+
+## Review Process
+
+- All submissions require review before being merged
+- Maintainers may request changes or suggest improvements
+- Be responsive to feedback on your pull request
+
+## C# Specific Guidelines
+
+- Target the same .NET version as the project
+- Avoid excessive dependencies unless absolutely necessary
+- Follow SOLID principles when applicable
+- Use async/await patterns appropriately for asynchronous operations
+- Be mindful of performance implications, especially for a networking library
+
+## Questions?
+
+If you have any questions about contributing to Telegram.Net, feel free to open an issue for discussion.
+
+Thank you for helping improve Telegram.Net!