Update README.md

Author: skjolber

README.md

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+![Build Status](https://github.com/skjolber/3d-bin-container-packing/actions/workflows/maven.yml/badge.svg) 
+[![Maven Central](https://img.shields.io/maven-central/v/com.github.skjolber.3d-bin-container-packing/parent.svg)](https://mvnrepository.com/artifact/com.github.skjolber.3d-bin-container-packing)
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 # 3d-bin-container-packing
 
 This library does 3D rectangular bin packing; it attempts to match a set of 3D items to one or more in a set of 3D containers. The result can be constrained to a maximum number of containers.