Added contribution instructions

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing to the TwinCAT ADS Guide in .NET! Your feedback, suggestions, and code contributions to improve the documentation are welcome. 
+
+## Getting Started
+
+If you’re new to contributing, here are some general steps to help you get started:
+
+1. **Read through the guide** on the [GitHub Pages site](https://fisothemes.github.io/TwinCAT-ADS-Guide-in-.NET/).
+2. **Check open issues** to see if others have already reported your question, idea, or issue. 
+3. **Submit a new issue** if you’ve found a bug or have a suggestion. Describe the change or problem as clearly as possible.
+4. **Create a pull request** if you’d like to contribute content directly. Additions, corrections, and other helpful content is always welcomed.
+
+## Ways to Contribute
+
+### Reporting Issues
+
+- Please use [GitHub Issues](https://github.com/fisothemes/TwinCAT-ADS-Guide-in-.NET/issues) to report any bugs, typos, or unclear sections.
+- Include as much detail as possible, such as:
+  - What part of the guide needs improvement or fixing
+  - Any screenshots, code samples, or error messages that clarify the issue
+
+### Suggesting Enhancements
+
+If you have ideas for additional topics or sections, submit a GitHub issue and label it as an `enhancement`. This helps keep the guide relevant and useful to more users.
+
+### Submitting Pull Requests
+
+1. **Fork the repository** and create a new branch for your changes.
+2. **Add clear and concise commits** that explain the purpose of each change.
+3. **Submit a pull request** describing your additions or edits.
+4. Make sure your pull request passes any checks and aligns with the overall style and tone of the guide.
+
+### Updating the Contributors Page
+
+If you make a contribution, **PLEASE ACKNOWLEDGE IT!** Please add your GitHub username to the [Contributors page](./src/book/contributors.md) in the book. You can do this by editing `contributors.md` in the `src/book/` directory. Simply add your GitHub username to the list in a new bullet point.
+
+### Formatting and Style
+
+Aim for a clear, concise, and accessible writing style. Please use British English and follow the formatting used throughout the guide. When possible, include sample code and references to make your contributions practical.