Added CONTRIBUTING.md

Author: williamchange

CONTRIBUTING.md

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+# Contributing to Material Maker
+
+Thank you for your interest in contributing to Material Maker!
+Please take a look below before making your first contribution.
+
+## Table of Contents
+
+- [Bug reports and feature suggestions](#bug-reports-and-feature-suggestions)
+- [Contributing pull requests](#contributing-pull-requests)
+- [Translations](#translations)
+- [Financial contributions](#contributing-financially)
+- [Contacting the developer](#contacting-the-developer)
+
+## Bug reports and feature suggestions
+
+Bug reports and feature suggestions should be made [here](https://github.com/RodZill4/material-maker/issues).
+
+Before creating a new issue, check if your problem/proposal is already mentioned by using the search function to avoid creating duplicates.
+
+When reporting a bug, make sure to follow the template and provide the following(when possible/if required):
+- Material Maker version
+- System information(OS, GPU)
+- What is expected and what happened instead
+- Outputs from the terminal
+- A screenshot/video showing the problem
+- Project file(if you believe the issue relates to a specific setup)
+
+## Contributing pull requests
+
+Using AI/LLM or any form of agentic coding for your pull request is not allowed.
+
+Use your own words when writing the description. If English is a barrier, consider using a dedicated language service(i.e. [Google Translate](https://translate.google.com/), [DeepL](https://www.deepl.com/en/translator)).
+
+**Using Godot Engine**
+
+Material Maker is built using the Godot Engine using GDScript. As such, it is required to [download the software](https://godotengine.org/) in order to open/test the project. The version used for development can be seen in the [project.godot](https://github.com/RodZill4/material-maker/blob/master/project.godot) file under the `config/features` key.
+
+If you are opening the project in Godot Engine for the first time, Game Embedding must be disabled or else the app may not launch in the editor.
+
+This can be set from the editor settings:
+
+`Run > Window Placement > Game Embed Mode` and setting it to `Disabled`
+
+**Formatting**
+
+Follow the [Godot Style Guide](https://docs.godotengine.org/en/stable/tutorials/scripting/gdscript/gdscript_styleguide.html) when formatting your code. Consider looking at surrounding code to copy their patterns and style.
+
+Additionally, 
+- Explictly type over inferred typing, i.e. `var my_button : Button = Button.new()` instead of `var my_button := Button.new()`.
+
+**PR Workflow**
+1. Fork the repository.
+2. Setup Git and clone the repository.
+2. Create a new branch: `git checkout -b feat-new-panel`
+3. Make your changes, and add them using `git add .`
+4. Commit your changes: `git commit -m "Implemented new panel"`
+5. Push your branch: `git push origin feat-new-panel`
+6. Create a new pull request and describe your changes.
+
+If your contribution resolves an existing issue, please add a [Github closing keyword](https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue) in the description of your pull request (e.g. - Closes #1234). This will make linked issue(s) to close automatically if your PR is merged.
+
+## Translations
+
+Material Maker provides translation files via an [online registry](https://rodzill4.github.io/material-maker/languages.json) which users can download from within the software.
+
+To contribute to this registry, create your translation file, host it somewhere linkable(i.e. in a github repository) and contact RodZill4 directly, via [Discord](https://discord.gg/PF5V3mFwFM).
+
+Both .csv and .po format are supported. You can use [this script](https://github.com/RodZill4/material-maker/blob/master/material_maker/locale/generate_po_template.gd) to generate a po template and edit your translation using [poedit](https://poedit.com/). Also see this [README.md](https://github.com/RodZill4/material-maker/blob/master/material_maker/locale/README.md).
+
+It might also help to use an existing translation as a basis.
+
+## Contributing financially
+
+Although Material Maker is provided for free, it is still possible to contribute financially to help other costs(such as website hosting) and allow more time to be spent on developing/maintaining the software.
+
+- Joining the [Patreon](https://www.patreon.com/rodzlabs)
+- Donating on [Itch.io](https://rodzilla.itch.io/material-maker/purchase)
+- Getting a [Steam copy](https://store.steampowered.com/app/4110830/Material_Maker/) and leaving a review
+
+## Contacting the developer
+
+For casual discussion around Material Maker or about contributing, you can find RodZill4 (`@rodzlabs`) on the [Discord](https://discord.gg/PF5V3mFwFM) server.