add CONTRIBUTING.md

Author: jacopodl

CONTRIBUTING.md

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+# Contributing to Argon
+We are excited that you are interested in contributing, Argon is a constantly evolving programming language and your contribution is essential to its success.
+
+## Opening new issue
+Feel free to open a new issue in the following cases:
+
+- Reporting bugs: If you encounter a bug, open an issue to report it, ensuring to include a detailed description of the problem, steps to reproduce it, and the environment you are working on (also, remember to specify the version of Argon you are using).
+
+- Suggesting improvements: If you wish to suggest an improvement, you can open a new issue, ensuring your proposal includes a detailed description of the changes you intend to make and the rationale behind why you believe it is an improvement.
+
+### Got a bright idea for Argon? We'd love to hear it!
+
+Just open a new issue and share your thoughts. It's the same process as 'suggesting improvements' (see above).  If the community loves it and you're feeling adventurous, you can even take charge! 
+
+1) Fork the project.
+2) Code your awesome idea into reality.
+3) Send us a pull request. We'll review it, and if everyone's happy, we'll merge it into the main project.
+
+This way, you get to see your idea come to life and help shape the future of Argon!
+
+## Pull request
+
+- Fork this repository and create a new branch.
+- Add your code changes.
+- Add tests if relevant.
+- Change / add documentation as needed if any API changed.
+
+When you're done, submit your pull request!
+
+**Note:** Pull requests that make purely cosmetic changes (such as whitespace, indentation, etc.) will not be considered.
+

README.md

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 # ‼️ Notes
 Argon is under active development, so many features are not yet active or available, a list (certainly not exhaustive) of the missing features is the following:
-* ~~No support for interactive mode.~~
-* ~~Lack of most of the built-in functionality for basic DataType (e.g. bytes::find, bytestream::split, ...).~~
-* ~~Garbage collector not enabled (currently the memory is managed only by the ARC).~~
-* ~~Limited I/O support.~~
-* ~~No multithreading support.~~
 * No debugging support.
 * Currently, all test cases are disabled ~~and out of date~~.
 
 # 🤝 Contributing
-There is currently no guide available to contribute to the development, but if you are interested you can contribute in several ways:
-* Argon core (C++)
-* Argon builtins libraries (C++ / Argon)
-* Writing documentation
+If you're interested, there are several ways you can contribute:
+
+- **Argon Core**: Help develop the Argon core (C++).
+- **Improving the Argon Standard Library**: Enhance the functionality of the [Argon Standard Library](https://github.com/argonlang/arlib).
+- **Writing/Improving Documentation**: Contribute by writing or improving documentation.
+- **Writing Examples**: Create examples to demonstrate Argon's capabilities.
+- **Sharing and Promotion**: Spread the word about the project and make it more widely known.
+
+For technical details, refer to the [contributing guidelines](CONTRIBUTING.md).
 
 # License
 Argon is primarily distributed under the terms of the Apache License (Version 2.0).