Adding ViroKit. Needs AWSCore :(

mobile/ios/ViroKit.framework/surface_functions_fsh.glsl

@@ -0,0 +1,18 @@
+struct VROSurface {
+    highp vec4 diffuse_color;
+    highp vec2 diffuse_texcoord;
+    highp float diffuse_intensity;
+    
+    lowp float shininess;
+    lowp  vec3 specular_color;
+    highp vec2 specular_texcoord;
+    
+    highp float roughness;
+    highp float metalness;
+    highp float ao;
+    
+    lowp float alpha;
+    lowp  vec3 normal;
+    highp vec3 position;
+    highp vec3 view;
+} _surface;