Add badges (#10)

Author: joaquimg

README.md

@@ -1,3 +1,7 @@
 # ModelAnalyzer.jl
 
 Experimental package with analysis and debugging tools for JuMP and MOI.
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+[![Build Status](https://github.com/jump-dev/ModelAnalyzer.jl/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/jump-dev/ModelAnalyzer.jl/actions?query=workflow%3ACI)
+
+[![codecov](https://codecov.io/gh/jump-dev/ModelAnalyzer.jl/branch/main/graph/badge.svg)](https://codecov.io/gh/jump-dev/ModelAnalyzer.jl)