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It's mostly up to Apple - the way the privacy controls on iOS are currently designed do not allow third party sites to pull user information from GameCenter. Until this changes, or we get special access from Apple, it's unlikely we'll be able to add it.
New Android games are typically added to the database through scanning player profiles. When a player in our database has unlocked an achievement then the game will be added. So, you could add your profile to the site and just earn an achievement in the game.
is it possible if you could get the information when a user sends you their game center profile/profile link. because you can still view someone's game center achievements if their profile appears (for example i can click someone's profile on leaderboard and if their settings are public it lets me see all their games and achievements)
It might be possible but you would have to manually yourself update every users profile but it would have to be once in a while. it's not efficient but it still works maybe until apple does something.