Added slang shaders for additional compute samples

shaders/slang/computeshader/shared.slang

@@ -0,0 +1,20 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+module shared;
+
+public Texture2D inputImage;
+public RWTexture2D<float4> resultImage;
+
+public float conv(in float kernel[9], in float data[9], in float denom, in float offset)
+{
+   float res = 0.0;
+   for (int i=0; i<9; ++i)
+   {
+      res += kernel[i] * data[i];
+   }
+   return saturate(res/denom + offset);
+}