Add a readme

Author: tecosaur

README.md

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+# Julia Syntax Highlighting
+
+<!-- [![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://JuliaLang.github.io/JuliaSyntaxHighlighting.jl/stable/) -->
+<!-- [![Dev](https://img.shields.io/badge/docs-dev-blue.svg)](https://JuliaLang.github.io/JuliaSyntaxHighlighting.jl/dev/) -->
+<!-- [![Build Status](https://github.com/JuliaLang/JuliaSyntaxHighlighting.jl/actions/workflows/CI.yml/badge.svg?branch=main)](https://github.com/JuliaLang/JuliaSyntaxHighlighting.jl/actions/workflows/CI.yml?query=branch%3Amain) -->
+<!-- [![Coverage](https://codecov.io/gh/JuliaLang/JuliaSyntaxHighlighting.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/JuliaLang/JuliaSyntaxHighlighting.jl) -->
+
+The `JuliaSyntaxHighlighting` package builds on the `StyledStrings` and
+`JuliaSyntax` standard libraries to provide a simple utility for applying syntax
+highlighting to text.