Add Vyxal

- Language name: Vyxal
- Source: https://github.com/Vyxal/Vyxal/
- Creator: Lyxal
- Type: Stack-based
- Specialty: General-use
- Docs: https://github.com/Vyxal/Vyxal/documents
- Quick-ref: https://github.com/Vyxal/Vyxal/blob/fresh-beginnings/documents/knowledge/Elements.txt
- Online interpreter: https://lyxal.pythonanywhere.com/
