Add docs/PROTOCOL.rst
Add docs/PROTOCOL.rst

bauerj/electrumx,thelazier/electrumx,thelazier/electrumx,Groestlcoin/electrumx-grs,shsmith/electrumx,bauerj/electrumx,erasmospunk/electrumx,Groestlcoin/electrumx-grs,Crowndev/electrumx,shsmith/electrumx,Crowndev/electrumx,erasmospunk/electrumx