Duplicate detection of names

[yuechen2001]

Steps to reproduce:

1. Run this command "add n/James Ho p/22224444 e/jamesho@example.com a/123,Clementi Rd, 1234665 t/friend t/colleague"
2. Run this command "add n/james Ho p/22224444 e/jamesho@example.com a/123,Clementi Rd, 1234665 t/friend t/colleague"

Expected: Confirmation for user to double check entered details Actual: Both contacts are added to address book

Great work on the app so far! I've found something that could possibly be improved for an even better user experience:

• Currently, users are able to add two contacts with the exact same details, apart from differences in upper/lower cases of the names entered (i.e. james and James
• It is quite likely that these two people are the exact same person, and the user is adding duplicated contacts into the address book.
• My suggestion would be to compare details of the to-be-added contact and that of contacts with the same case-insensitive name in the address book. If both are the same, it is likely that the user forgotten about the duplicate contact and hence show a warning.

[nus-pe-script]

Your response not required for this bug as the team has accepted the bug as it is.