Explain architecture briefly in README
Explain architecture briefly in README

Mentioning hterm and wetty so that people don't get confused that GoTTY
has an original terminal implementation.

freakhill/gotty,stigkj/gotty,yudai/gotty,xiaods/gotty,linuxsky/gotty,paran0ids0ul/gotty,yudai/gotty,codeskyblue/gotty,moul/gotty,ivan-mlnn/gotty,aOJzQT/gotty,yubo/gotty,yubo/gotty,uovobw/gotty,vjscjp09/gotty-test1,hernad/gotty,xiaods/gotty,rmetzler/gotty,hernad/gotty,abhishekgahlot/gotty,QuentinPerez/gotty,uovobw/gotty,yudai/gotty,CiscoCloud/gotty,yudai/gotty,hernad/gotty,stigkj/gotty,paran0ids0ul/gotty,moul/gotty,yubo/gotty,jasonchaffee/gotty,wdxxs2z/gotty,abhishekgahlot/gotty,abhishekgahlot/gotty,ruo91/gotty,ujuettner/gotty,freakhill/gotty,moul/gotty,wdxxs2z/gotty,freakhill/gotty,aOJzQT/gotty,CiscoCloud/gotty,yh453926638/gotty,ujuettner/gotty,uovobw/gotty,whismat/gotty,linuxsky/gotty,vjscjp09/gotty-test1,jasonchaffee/gotty,jasonchaffee/gotty,snowsnail/gotty-1,QuentinPerez/gotty,codeskyblue/gotty,ruo91/gotty,Ryezhang/gotty,aOJzQT/gotty,ivan-mlnn/gotty,snowsnail/gotty-1,Ryezhang/gotty,xiaods/gotty,CiscoCloud/gotty,vjscjp09/gotty-test1,yh453926638/gotty,whismat/gotty,vjscjp09/gotty-test1,yubo/gotty,paran0ids0ul/gotty,moul/gotty,rmetzler/gotty,yh453926638/gotty,Ryezhang/gotty,ruo91/gotty,rmetzler/gotty,ujuettner/gotty,linuxsky/gotty,whismat/gotty,yubo/gotty,QuentinPerez/gotty,codeskyblue/gotty,stigkj/gotty,ivan-mlnn/gotty,snowsnail/gotty-1,wdxxs2z/gotty