Add Brány Skeldalu

[Brány Skeldalu](https://www.mobygames.com/game/55639/brany-skeldalu/) is a Czech dungeon crawler from 1998. It was never released internationally, so its title is Czech-only and there's no official translation. The developer released official game source code in 2008 on [Sourceforge](https://sourceforge.net/projects/skeldal/).