add resource to update problem
add resource to update problem

leonfeng/learnyoumongo,cybot1711/learnyoumongo,jqk6/learnyoumongo,WilBeCoding/learnyoumongo,venturads/learnyoumongo,metakata/learnyoumongo,KarteekRakshit/learnyoumongo,evanlucas/learnyoumongo