🦺 Create CONTRIBUTING.md

Signed-off-by: Bjorn Lammers <walkxnl@gmail.com>

CONTRIBUTING.md

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+# 🎉 Contributing Guidelines
+
+Thank you for your interest in contributing to our icon repository! To ensure that everything runs smoothly, we've set out some guidelines for contributors.
+
+## 🌟 Icon Specifications
+
+- Each icon should be in `PNG` format and have a height of exactly `512px`. Width does not matter. ❗️(No upscales! If the correct size cannot be found, a smaller height will be accepted.)
+
+- Each icon should include both a `PNG` and `SVG` version. If an `SVG` cannot be found, then only a `PNG` version is required.
+
+- Icons should be named after their full name, with spaces replaced by dashes. For example, "Facebook Messenger" should be named `facebook-messenger.png`.
+
+- Monochrome icons should default to a dark version. Light versions should be named `service-light.png`. If a light version is not available, use https://pinetools.com/colorize-image to change its color.
+
+- If an `SVG` is available for an icon, the `PNG` should be a conversion of that `SVG`. Use https://ezgif.com/svg-to-png to do this. Set the height to `512px` and leave the width empty.
+
+## 🤝 Contributing
+
+1. Fork the repository to your own GitHub account.
+2. Clone the repository to your local machine.
+3. Add your icon(s) to the repository, following the specifications listed above.
+4. Push your changes to your fork.
+5. Create a pull request in the main repository.
+
+## 🚨 Code of Conduct
+
+Please note that by contributing to this repository, you agree to abide by our code of conduct, which can be found in the [CODE_OF_CONDUCT.md](CODE_OF_CONDUCT.md) file in the repository.
+
+---
+
+If you have any questions or concerns, please don't hesitate to reach out to me at contact@walkx.fyi. Happy contributing! 🙌