Merge pull request #181 from IceWizard4902/branch-update-VinhDG

Update ppp for Vinh

Merge pull request #92 from IceWizard4902/branch-UserGuide-Clear

Update the UserGuide for Clear feature

Merge pull request #72 from AY2122S1-CS2103-T16-4/update-dg-yongxiang

Update multiplicity for member ui class diagram

Merge pull request #57 from yongxiangng/branch-feature-details

Update details to accept INDEX as args

Merge pull request #39 from yongxiangng/branch-feature-details

Implement details command