Add campaign idiom

@johnwunder 

In 23f73fe I modifed the python for the `victim-targeting` idiom, since it was missing an import

1ed4a30 has the content of the new idiom, I didn't include the "picture of excel document" thing since it seemed ancillary
This is a good sentence. Can you add something similar for when you have information about a threat actor but not a campaign? Maybe you have some identity information for a malware developer or something so you don't necessarily have a campaign but you do have a threat actor.