Add ARCHITECTURE.rst
Add ARCHITECTURE.rst

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