Add CI badges to README.md.

README.md

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 # EnumX.jl
 
+[![CI][gh-actions-img]][gh-actions-url]
+[![codecov][codecov-img]][codecov-url]
+
 This is what I wish [`Base.@enum`][at-enum] was.
 
 ## Usage
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 [CEnum]: https://github.com/JuliaInterop/CEnum.jl
 [SuperEnum]: https://github.com/kindlychung/SuperEnum.jl
 [NamespacedEnums]: https://github.com/christopher-dG/NamespacedEnums.jl
+
+
+[gh-actions-img]: https://github.com/fredrikekre/EnumX.jl/actions/workflows/ci.yml/badge.svg?branch=master&event=push
+[gh-actions-url]: https://github.com/fredrikekre/EnumX.jl/actions/workflows/ci.yml
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+[codecov-img]: https://codecov.io/gh/fredrikekre/EnumX.jl/branch/master/graph/badge.svg?token=K7C8OASVZR
+[codecov-url]: https://codecov.io/gh/fredrikekre/EnumX.jl