Devilutionx: Add list of known mods to README?

[mewmew]

This is a start, feel free to add more:

• https://github.com/qndel/Infernity
• https://github.com/Manuel-K/devilutionX-QOL-patches
• https://github.com/sergi4ua/equine
• ...

[AJenbo]

By request:

• Render for the Raspberry Pi Sense HAT: https://github.com/AJenbo/devilutionX/tree/SenseHAT
  alt="Game play video" width="240" height="180" border="10" />

• Rouge-like text render: https://github.com/AJenbo/devilutionX/tree/roguelike
  alt="Game play video" width="240" height="180" border="10" />

• Per pixel lighting https://github.com/qndel/devilutionX/tree/pixellight
  

[mewmew]

Closing this issue for now. If you know of any mods that are not yet on the list, just send a PR :)