Added sample repository configuration for Maven projects deploying to the Alfresco Artifacts Repository

Created support repos and roles and tested SNAPSHOT deployment (see https://artifacts.alfresco.com/nexus/index.html#nexus-search;quick~share-oauth).

With the provided configuration and matching credentials in ~/.m2/settings.xml, a 'mvn deploy' will suffice to publish the artifacts.

If the version is set to release, release repo will be used automaticall.y