A800 core added

A new core has been added for RetroArch Steam.

https://store.steampowered.com/app/1238580/RetroArch__A800/

You can download this core either from within RetroArch Steam by going to Manage Cores, or by simply downloading it for free from Steam.

If you'd like to learn more about these cores, you can go to our Documentation Center site.

Documentation for the A800 core can be found here.

There are now 51 cores available in total for RetroArch Steam.