added instruction to install lumify-root to build from source [Fixes #70517134]
added instruction to install lumify-root to build from source [Fixes #70517134]

lumifyio/lumify,TeamUDS/lumify,bings/lumify,Steimel/lumify,TeamUDS/lumify,dvdnglnd/lumify,bings/lumify,dvdnglnd/lumify,dvdnglnd/lumify,lumifyio/lumify,bings/lumify,dvdnglnd/lumify,RavenB/lumify,RavenB/lumify,lumifyio/lumify,Steimel/lumify,j-bernardo/lumify,lumifyio/lumify,TeamUDS/lumify,j-bernardo/lumify,RavenB/lumify,bings/lumify,j-bernardo/lumify,RavenB/lumify,RavenB/lumify,Steimel/lumify,j-bernardo/lumify,j-bernardo/lumify,Steimel/lumify,Steimel/lumify,bings/lumify,TeamUDS/lumify,lumifyio/lumify,dvdnglnd/lumify,TeamUDS/lumify