Adding a simple example demonstrating how to use SBT record data

data/shaders/hlsl/raytracingsbtdata/closesthit.rchit

@@ -0,0 +1,27 @@
+// Copyright 2020 Google LLC
+
+struct Attribute
+{
+  float2 attribs;
+};
+
+struct Payload
+{
+[[vk::location(0)]] float3 hitValue;
+};
+
+struct SBT {
+  float r;
+  float g;
+  float b;
+};
+[[vk::shader_record_ext]]
+ConstantBuffer<SBT> sbt;
+
+[shader("closesthit")]
+void main(inout Payload p, in float2 attribs)
+{
+  // Update the hit value to the hit record SBT data associated with this 
+  // geometry ID and ray ID
+  p.hitValue = float3(sbt.r, sbt.g, sbt.g);
+}