Create README.md

README.md

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+# Mednafen-Core
+OpenEmu Core plugin with Mednafen with hacks to the PSX core for better graphics.
+
+#### Extra features included in this fork
+* 2x upscaling (ported from https://github.com/libretro/beetle-psx-libretro)
+* Black borders reduced for PAL games
+
+#### Known bugs - pull requests welcome!
+* Deinterlacing is broken, hence the boot screen is messed up. 
+Not an issue for mostgames though could make cutscenes and videos look bad.
+
+#### Notes
+* Upscaling can cause graphical glitches and so will reduce the accuracy of the game.
+* Upscaling is hardcoded. Would be nice to dynamically load from a config file in future.
+* Upscaling is done on the host CPU and IS CPU intensive! Would be nice to offload this to the host GPU in future.
+* Reduction of PAL black borders changes the aspect ratio of the game. 
+For NTSC games poorly converted to PAL (i.e. most games) this should actually make the game look better 
+and more true to the original release as intended by the developers - i've tried to tweak it so that the 
+aspect ratio is the same as NTSC resolution. On the other hand, original or properly converted PAL games 
+will have incorrect aspect ratio and may even have edges of the screen cut off. If you notice any PAL games
+with this let me know and we'll see if we can tweak the numbers further.