adding examples for assignment 3
adding examples for assignment 3


Former-commit-id: a1c0d2de8e941333562d69adf767e007b7777fa2
Former-commit-id: 49914bfd7d2a306aacf84619c30dbb92d5796906
Former-commit-id: 932f612c60eb8187a98778953959195b39c22519
StanfordHCI/cs247,StanfordHCI/cs247,StanfordHCI/cs247