You achieved an S??

Hi, I'm new to the forums (literally my first post). Just a quick question or two. Does anybody know when Hextech crafting is out for EUW? Also, I played a game just recently and I got an S rating. In chat it said,'You achieved an S rating' or something to that effect. Also showed this for all the other players that achieved an S rating. What's this and why? Obviously I know it shows how some people did but is there anything other than that?
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