Add readme to slang shader folder

Author: SaschaWillems

shaders/slang/README.md

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+# Slang shaders
+
+This folder contains shaders using the [Slang shading language](https://github.com/shader-slang/slang/releases).
+
+These require a different SPIR-V environment than glsl/hlsl. When selecting slang shaders, the base requirement for all samples is raised to at least Vulkan 1.1 with the SPIRV 1.4 extension.
+
+If you want to compile these shaders to SPIR-V, please use the latest release from [here](https://github.com/shader-slang/slang/releases) to get the latest bug fixes and features required for some of the samples. Minimum version for all shader to properly compile is `2025.16.1`.