README.md: add Nine Circles of Hell

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@ -20,6 +20,7 @@ The engine is used by several commercial game studios and computer-science cours
- [Lightspeed Frontier (on Steam)](https://store.steampowered.com/app/548650/Lightspeed_Frontier/)
- [Skullstone](http://www.skullstonegame.com/)
- [Spoxel (on Steam)](https://store.steampowered.com/app/746880/Spoxel/)
- [Nine Circles of Hell](https://store.steampowered.com/app/1200600/Nine_Circles_of_Hell/)
## Getting started