public DomainFile addDomainFile(String parentPath, String filename) throws Exception {
		DomainFolder parent = getFolder(parentPath);
		DomainFile df = programManager.addProgramToProject(parent, filename);
		return df;
	}
Adds the file with the given name to this fake project.  The file must exist in the
test data area. 

<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 parentPath the destination parent folder path
@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