Add shaders re-implemented in HLSL

These were written against the shaders at revision eddd724e7.
There have been changes made since then, which will need to be mirrored.

See `data/hlsl/README.md` for the current status of each sample.

data/hlsl/tessellation/base.frag

@@ -0,0 +1,20 @@
+// Copyright 2020 Google LLC
+
+Texture2D textureColorMap : register(t2);
+SamplerState samplerColorMap : register(s2);
+
+struct DSOutput
+{
+[[vk::location(0)]] float3 Normal : NORMAL0;
+[[vk::location(1)]] float2 UV : TEXCOORD0;
+};
+
+float4 main(DSOutput input) : SV_TARGET
+{
+	float3 N = normalize(input.Normal);
+	float3 L = normalize(float3(0.0, -4.0, 4.0));
+
+	float4 color = textureColorMap.Sample(samplerColorMap, input.UV);
+
+	return float4(clamp(max(dot(N,L), 0.0), 0.2, 1.0) * color.rgb * 1.5, 1);
+}