Asset copyright information for the *ex plugin

[albertopoljak]

As per discussion in Discord, I took a quick look to see if I could find source for some assets.

For this asset: koishi/plugins/sex/assets/chiruno-probably-sex.gif

Source is Fantasy Kaleidoscope ~The Memories of Phantasm You can confirm it by looking up "Touhou Memories of Phantasm Cirno Moments" on Youtube.

Additionally, pretty sure the same source is for these as well (didn't completely confirm): koishi/plugins/sex/assets/chiruno-maybe-sex.gif koishi/plugins/sex/assets/chiruno-no-sex.gif koishi/plugins/sex/assets/chiruno-yes-sex-fast.gif koishi/plugins/sex/assets/chiruno-yes-sex.gif

[HuyaneMatsu]

Added information for chiruno-probably-sex.gif. If you can confirm the rest, will add them as well.