Add slang shaders for tessellation samples

shaders/slang/terraintessellation/skysphere.slang

@@ -0,0 +1,42 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+    float3 Pos;
+    float3 Normal;
+    float2 UV;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float2 UV;
+};
+
+struct UBO
+{
+    float4x4 mvp;
+};
+ConstantBuffer<UBO> ubo;
+
+Sampler2D samplerColorMap;
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    output.Pos = mul(ubo.mvp, float4(input.Pos, 1.0));
+    output.UV = input.UV;
+    return output;
+}
+
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+	return samplerColorMap.Sample(input.UV);
+}