adding contributing guidelines

CONTRIBUTING.md

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+# Contributing
+
+This docuement is new, so its much appreciated, if you ask question or give feedback. Don't hesitate to open an issue.
+
+This document aims to provide a guideline for people wanting to contribute to the project. It does not aim to describe the project, please see the README.md for this. 
+
+# Conduct
+
+Code of conduct is taken form the (rust project code of conduct)[https://www.rust-lang.org/policies/code-of-conduct].
+
+
+# Getting started
+
+## Know the basics of rust
+
+There are a wide variety of resources available to learn rust. The following resources may be helpful:
+
+- [The Rust Programming Language](https://doc.rust-lang.org/book/)
+- [Rust by Example](https://doc.rust-lang.org/rust-by-example/)
+
+## Understanding the code
+
+The code and its function may be confusing at first. The following resouces may help you understand the code:
+
+- [m-bus website](https://m-bus.com/documentation). This document is a good starting point for understanding the protocol. It is outdated but still useful starting point. The m-bus norm is mostly backwards compatible. 
+
+
+## Making changes to the code
+1. (Install the rust toolchain)[https://www.rust-lang.org/tools/install]
+2. Install your favorite IDE such as vscode, intellij or neovim
+3. Install git and clone the repository `git clone git@github.com:maebli/m-bus-parser.git`
+4. Run the tests `cargo test` and see if you can run the tests
+
+
+# How to contribute
+
+1. Fork the repository
+2. Create a branch `git checkout -b feature/your-feature`
+3. Make your changes
+4. Run the tests `cargo test`
+5. Commit your changes `git commit -m "feat: your feature"`
+6. Push your changes `git push origin feature/your-feature`
+7. Create a pull request
+
+