Create a Parse PFCloud Script - Very Simple!

Hi there, I need somebody to create a Parse PFCloud Script which creates a relation for a User with a second user. In my Objective-C code, I have a NSMutableDictionary that contains the ObjectId for 2 users (for example, User1 and User2). I use this dictionary as the parameter for 'PFCloud callFunctionInBackground:..withParameters: *myDictionary* '. Now what I need you to do is create a PFCloud script that gets these 2 User Id's from the parameter and then create a relation for User1 with User2 in a column called "Friends". This seems simple but I have little experience with Javascript. Please message me if you have any questions.