public ProjectBuilder setProperties(Map<String, String> properties) {
		if (properties != null) {
			this.properties = properties;
		} else {
			this.properties = Collections.emptyMap();
		}
		return this;
	}
This class constructs a <code>Project</code>. It uses the options given by
the user on the command line or things that are part of the user's
environment.
src/main/java/dev/jbang/source/ProjectBuilder.java