Adds missing yarn.lock file.
Adds missing yarn.lock file.

pebie/react-universally-node-config,ctrlplusb/react-universally,deanslamajr/trakta.co,kennethtruong/react-webapp,oyeanuj/react-universally,diondirza/react-universally,igorsvee/react-ssr,brettsnaidero/bsd,LorbusChris/react-universally,ueno-llc/starter-kit-universally,ueno-llc/starter-kit-universally,sergiokopplin/react-universally