Make artifacts available for other compas repositories

[dlabordus]

There are now 2 repositories in which there is code that depends on classes from core-commons from compas-core repository. After pull requests are merged the artifact should be available for other parts of compas to be used.

Where are think about https://docs.github.com/en/packages or maybe Maven Central to store there artifacts.

[Sander3003]

Please add documentation for others: contributing.md.

[dlabordus]

We are using Github packages and in the contribution there is a description about how to used these repositories in a Gradle build.