Add slang shader for descriptor sets sample

shaders/slang/descriptorsets/cube.slang

@@ -0,0 +1,51 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+    float3 Pos;
+    float3 Normal;
+    float2 UV;
+    float3 Color;
+};
+
+struct VSOutput
+{
+    float4 Pos : SV_POSITION;
+    float3 Normal;
+    float3 Color;
+    float2 UV;
+};
+
+// Slang auto generates bindings by order of descriptors
+// So the UBO is bound to slot 0, the sampler to slot 1
+// due to their order in the shader
+
+struct UBOMatrices {
+    float4x4 projection;
+    float4x4 view;
+    float4x4 model;
+};
+ConstantBuffer<UBOMatrices> uboMatrices;
+
+Sampler2D samplerColorMap;
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    output.Normal = input.Normal;
+    output.Color = input.Color;
+    output.UV = input.UV;
+    output.Pos = mul(uboMatrices.projection, mul(uboMatrices.view, mul(uboMatrices.model, float4(input.Pos.xyz, 1.0))));
+    return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input)
+{
+    return samplerColorMap.Sample(input.UV) * float4(input.Color, 1.0);
+}