Add ability to add private ratings to movies

[veyndan]

I currently use iMDB to store movies that I've watched by adding a rating to the movie. I rate them to remind myself what I thought of the movie, as sometimes it's been several years since I last watched it. I'd love to be able to add ratings to movies that I've watched (i.e., an integer from 1-10), as I want to move away from iMDB without losing this ability. These ratings would be completely private to me (i.e., I don't care about having the aggregate user rating of a film that iMDB offers).

I'm not sure whether this is in the scope of the project or not, but if it is, I'd be happy to have a go at implementing it!