added readme + license

README.md

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+# UEMatLib
+
+UEMatLib is a library of materials for use in Unreal Engine. Each material comes with a preview, snippet, and description to help you choose the right one for your project.
+
+## Materials
+
+The materials are defined in the `materials.json` file. Each material has the following properties:
+- `author`: The author of the material.
+- `name`: The name of the material.
+- `categories`: A list of categories the material belongs to.
+- `preview`: A path to the preview image of the material.
+- `snippet`: A path to the snippet file of the material.
+- `description`: A brief description of the material.
+
+## Usage
+
+To use a material, simply copy the snippet from the `snippets` folder and paste it into your Unreal Engine project.
+
+## Contributing
+
+I welcome contributions! If you have a material snippet you'd like to add, please follow these steps:
+1. Fork the repository.
+2. Add your material to the `materials.json` file.
+3. Add your preview image to the `thumbnails` folder.
+4. Add your snippet file to the `snippets` folder.
+5. Submit a pull request.
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](./LICENSE) file for details.