If you are only doing a court marriage, then get lots of pictures of it, showing you with everyone who attended. You do not have to have a traditional wedding or a church wedding as well. But if you are having a court marriage and also a traditional or church wedding, get lots of photos of both. It will not hurt your application if you only have a court wedding, just make sure you have lots of evidence of your relationship.
I have seen visa officers question why there was only a court marriage in the following circumstances:
1. One or both spouse is very religious. They then questioned why they didn't have a church wedding.
2. It is an arranged marriage from India. In this case the more lavish and elaborate the wedding, the better, from the visa officer's point of view. If there are few guests, or people are dressed casually, they wonder why you didn't marry the 'normal' way for your culture.
Basically, they want to see evidence of a wedding that is normal for your culture. In most Western countries, a court wedding is perfectly acceptable, so it is enough for your PR application.
Note: the visa officer definitely will expect you to have gone on a honeymoon, so try to, and take photos, keep the hotel and restaurant receipts, and receipts for any sightseeing.
