Added ranks for solo mode

I love playing Apex, but I don’t like chatting while playing, so I’ve spent about 80% of my time in solo queue. Maintaining Predator rank is easy when I play in a party, but it’s not realistic in solo queue. I find it really exciting that what used to be judged as a team effort now reflects individual skill. Having proven myself in past Arena ranks, I think solo mode ranks could also be a great way to showcase skill and make new connections—just like those who reached Arena Predator and teamed up with Battle Royale players.