public DomainFile addDomainFile(String filename) throws Exception {
		Project project = getGhidraProject().getProject();
		DomainFile df = programManager.addProgramToProject(project, filename);
		return df;
	}
Adds the file with the given name to this fake project.  The file must exist in the
test data area. The file will be put in the root folder of the project.

<P>Note: this does NOT add the file to version control.  Thus, the file will not be 
visible to other projects in the parent repo.  To add to version control, call
{@link #addToVersionControl(DomainFile, boolean)}.

@param filename the filename (including path of the real file on disk)
@return the newly created domain file
@throws Exception if there are any issues finding or adding the file to the project
Ghidra/Features/Base/src/test/java/ghidra/base/project/FakeSharedProject.java