Add composer stanza to FirstSetup.md
Add composer stanza to FirstSetup.md

CON-In-A-Box/ConComSignIn,CON-In-A-Box/ConComSignIn,CON-In-A-Box/CIAB-SignIn,CON-In-A-Box/CIAB-SignIn,CON-In-A-Box/ConComSignIn,CON-In-A-Box/ConComSignIn,CON-In-A-Box/CIAB-SignIn,CON-In-A-Box/CIAB-SignIn