Add in ability to appear offline on league client?

I would like an option to be able to appear offline on league. I get spammed with messages from friends when I'm playing ranked games and it would be nice to have the option so I can focus on my games and not have people asking questions about my match, or trying to get me to duo or play normals. I think a lot of players would like this feature and I personally feel like it should have been implemented into the client by now. In my case what ends up happening a lot of the time is I get harassed and end up having to get off the game or go on alt accounts at certain times of the day when annoying friends are online if I don't feel like playing normal games.
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