Create CONTRIBUTING.md

Author: MatusOllah

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing to slogcolor! We welcome contributions from everyone.
+
+## Languages
+
+Please write issues and pull requests in **English** or **Slovak**. Thank you!
+
+---
+
+Prosím, píšte issues a pull requests buď v **angličtine**, alebo v **slovenčine**. Ďakujeme!
+
+## How to contribute
+
+See [Open Source Guide on How to Contribute](https://opensource.guide/how-to-contribute/) for general guidelines.
+
+Thank you for contributing to slogcolor! 😊