add docs badges

Author: baggepinnen

README.md

@@ -4,6 +4,8 @@
 >  To be presented at JuliaCon 2024. https://pretalx.com/juliacon2024/talk/KGAKA8/
 
 [![Build Status](https://github.com/JuliaComputing/ModelingToolkitSampledData.jl/actions/workflows/CI.yml/badge.svg?branch=main)](https://github.com/JuliaComputing/ModelingToolkitSampledData.jl/actions/workflows/CI.yml?query=branch%3Amain)
+[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliacomputing.github.io/ModelingToolkitSampledData.jl/stable/)
+[![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://juliacomputing.github.io/ModelingToolkitSampledData.jl/dev/)
 
 A standard library with discrete-time components for ModelingToolkit.
 
@@ -13,3 +15,5 @@ Requires [JuliaSimCompiler.jl](https://help.juliahub.com/juliasimcompiler/stable
 To install this library, first follow the [installation instructions for JuliaSimCompiler](https://juliacomputing.github.io/JuliaSimCompiler.jl/stable/#Installing-and-Using-JuliaSimCompiler). In particular, you need to [add the JuliaHub Registry](https://help.juliahub.com/juliasim/dev/gettingstarted/juliahubregistry/). 
 
 After the registry is added and JuliaSimCompiler is installed, you may install this package. This package is currently not registered in any register and must thus be installed by URL.
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