docs(README): add initial README.md file

README.md

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+# Colorus
+
+A fluid JavaScript tool that simplifies color manipulation and supports a variety of color spaces.
+
+## Usage
+
+```js
+import Colorus from 'colorus'
+
+const color = new Colorus('#ff0014') // Create a color object with red shade.
+
+console.log(color.rgb) // Output: {r:255,g:0,b:20}
+console.log(color.toHex()) // Output: '#FF0014'
+```
+
+## Contributing
+
+Contributions are welcomed! Feel free to fork the repository, make your changes, and submit a pull request.
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details.