TLS feature example for wss server

[incker]

Hello,

You have added ​documentation about TLS features to README, but any way I think people (and me also) find it hard to build websocket server over TLS, and there are no examples in internet.

So adding a wss example server will be a lot useful. Or maybe reply to this issue, will be indexed by google and will be helpful.

Any way, thank you a lot for cool crate

[Voronar]

snapview/tungstenite-rs#127

[jxs]

Hi, thanks for your interest! And thanks @Voronar, I am going to close this one in favor of #127 then