readme: add 'run etcd on k8s' section
readme: add 'run etcd on k8s' section

joshix/etcd,OyTao/etcd_learning,li-ang/etcd,rnaveiras/etcd,a-robinson/etcd,mickep76/etcd,endocode/etcd,armstrongli/etcd,joshix/etcd,ajityagaty/etcd,lorneli/etcd,mqliang/etcd,jlamillan/etcd,visheshnp/etcd,sinsharat/etcd,whuwxl/etcd,lumjjb/etcd,mqliang/etcd,hongchaodeng/etcd,vimalk78/etcd,gyuho/etcd,mkumatag/etcd,bdarnell/etcd,xiang90/etcd,ravigadde/etcd,dannysauer/etcd,glevand/coreos--etcd,ajityagaty/etcd,lorneli/etcd,endocode/etcd,bdarnell/etcd,jlamillan/etcd,dannysauer/etcd,bluebreezecf/etcd,qqsun8819/etcd,handsomesun/etcd,akauppi/etcd,mkumatag/etcd,cockroachdb/etcd,etcd-io/etcd,li-ang/etcd,tguangch/etcd,ravigadde/etcd,yudai/etcd,plasticbox/etcd,insequent/etcd,OyTao/etcd_learning,qqsun8819/etcd,CrazyJvm/etcd,mkumatag/etcd,bluebreezecf/etcd,heyitsanthony/etcd,rchicoli/etcd,rnaveiras/etcd,coreos/etcd,fanminshi/etcd,YuleiXiao/etcd,glevand/coreos--etcd,visheshnp/etcd,gyuho/etcd,rnaveiras/etcd,armstrongli/etcd,akauppi/etcd,handsomesun/etcd,coreos/etcd,CrazyJvm/etcd,ajityagaty/etcd,etcd-io/etcd,YuleiXiao/etcd,sebrandon1/etcd,hongchaodeng/etcd,heyitsanthony/etcd,whuwxl/etcd,yudai/etcd,a-robinson/etcd,mickep76/etcd,tguangch/etcd,vimalk78/etcd,sebrandon1/etcd,insequent/etcd,fanminshi/etcd,etcd-io/etcd,mqliang/etcd,cockroachdb/etcd,rchicoli/etcd,lumjjb/etcd,xiang90/etcd,plasticbox/etcd,sinsharat/etcd