@Nonnull
	public SourceSet addDependency(String dependency) {
		dependencies.add(dependency);
		return this;
	}
This class combines source files, resources and dependencies that are
considered to be a single unit. Together with the information in a
<code>Project</code> and possibly other <code>SourceSets</code> it can be
turned into something that can be executed.
src/main/java/dev/jbang/source/SourceSet.java