Add ILLUSION and ILLGAMES as Publishers and Developers

[PAdresse444]

ILLUSION and "the totally not same company after they went banckrupt" ILLGAMES are self publishing Japanese adult game studios.

The website does not offer an obvious way to suggest new studios and publishers, so I try it here.

here are their steamdb entries:

• https://steamdb.info/developer/ILLUSION/
• https://steamdb.info/publisher/ILLUSION/
• https://steamdb.info/developer/ILLGAMES/
• https://steamdb.info/publisher/ILLGAMES/