Trading in LoL

I have a request of something that should be added to League of Legends. I think it would be a great idea to be able to trade skins and champions with other people. There are some skins and champions I have gotten from mystery that I do not want but my friends want. If I could trade with them, we can both get something we want and get rid of something we do not want. I really would like if this was a feature in LoL.