Add badges to README.

Author: samuelsonric

README.md

@@ -1,5 +1,8 @@
 # MathOptChordalDecomposition.jl
 
+[![CI](https://github.com/samuelsonric/MathOptChordalDecomposition.jl/actions/workflows/ci.yml/badge.svg)](https://github.com/samuelsonric/MathOptChordalDecomposition.jl/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/gh/samuelsonric/MathOptChordalDecomposition.jl/graph/badge.svg?token=z67ISx3vkD)](https://codecov.io/gh/samuelsonric/MathOptChordalDecomposition.jl)
+
 MathOptChordalDecomposition.jl is a [MathOptInterface.jl](https://github.com/jump-dev/MathOptInterface.jl) layer that implements chordal decomposition of
 sparse semidefinite constraints.