Add Aqua.jl badge

Author: tkf

README.md

@@ -1,6 +1,7 @@
 # ThreadsX: `$nthreads x` faster functions with `Base` API
 
 [![GitHub Actions](https://github.com/tkf/ThreadsX.jl/workflows/Run%20tests/badge.svg)](https://github.com/tkf/ThreadsX.jl/actions?query=workflow%3A%22Run+tests%22)
+[![Aqua QA](https://img.shields.io/badge/Aqua.jl-%F0%9F%8C%A2-aqua.svg)](https://github.com/tkf/Aqua.jl)
 
 ## tl;dr