Add blueMSX info


https://github.com/libretro/libretro-super/pull/67#Adding blueMSX info file, please give it a once-over
- libretro.c only mentions rom|mx2 for supported filenames, it might support more (mx1/col/dsk)
- Don't know if firmware is required, roms don't seem to load :warning:
  - [C-BIOS](http://cbios.sourceforge.net/) might need to be added here

@aliaspider any ideas?