Reactor-netty as a server-adapter

Hi,

I work with the gurselan, who contributed the bulk of the Client+reactor-netty integration work.  Our team would also like to leverage reactor-netty on the server-side.  For that, we are looking into adding a server-adapter.  While we would love it if someone else contributed it, we are willing to give it a go

I created this issue to follow your contribution guidelines and get early feedback.  If you think this work shouldn't be done for some reason, please let us know.