Created Shaders (markdown)

Shaders.md

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+Shaders are RetroArch compatible and can be downloaded from the following locations:
+
+### Cg Shaders: 
+https://github.com/libretro/common-shaders
+
+Cg is an older standard and uses the Cg library from NVIDIA that NVIDIA no longer supports. Cg shaders will work in both Direct3D and OpenGL modes in the Windows version of Snes9x. Some features of this standard aren't implemented by Snes9x, so other formats are preferred.
+
+### GLSL Shaders:
+https://github.com/libretro/glsl-shaders
+
+GLSL shaders will work with the OpenGL modes in the Windows and GTK ports.
+
+### Slang shaders:
+https://github.com/libretro/slang-shaders
+
+Slang shaders will work with the OpenGL modes in the Windows and GTK ports. 
+
+