add notice about move to Cogent Core

README.md

@@ -1,5 +1,7 @@
 # gosl
 
+**IMPORTANT UPDATE:** [Cogent Core](https://github.com/cogentcore/core) now has an improved version of gosl in its [vgpu/gosl](https://github.com/cogentcore/core/tree/main/vgpu/gosl) package and associated sub-packages.  This version will not be further maintained or developed.  The v1 version is still needed for the v1 version of emergent.
+
 `gosl` implements Go as a shader language for GPU compute shaders: converts Go code to HLSL, and then uses the [glslc](https://github.com/google/shaderc) compiler (e.g., from a vulkan package) to compile into an `.spv` SPIR-V file that can be loaded into a vulkan compute shader.  `glslc` must be [installed](https://askubuntu.com/questions/1252585/how-to-install-glslc-on-ubuntu-20-04)!
 
 Thus, `gosl` enables the same CPU-based Go code to also be run on the GPU.  The relevant subsets of Go code to use are specifically marked using `//gosl:` comment directives, and this code must only use basic expressions and concrete types that will compile correctly in a shader (see [Restrictions](#restrictions) below).  Method functions and pass-by-reference pointer arguments to `struct` types are supported and incur no additional compute cost due to inlining (see notes below for more detail).