Diff person with the same email could be added

[YH-15]

Since 2 persons cannot have the same email address, I think it would be optimal if more sanity checks could be added to avoid: the same email address being used by different individuals in the TABS system.

• The newly added person shares the same email as John:
  

• The issue could be replicated by using the following command:
  addperson n/John Doe p/98765432 e/johnd@example.com a/John street, block 123, #01-01
  addperson n/Sample name p/87438807 e/johnd@example.com a/John street, block 123, #01-01

[soc-se-bot]

Team's Response

This is the intended feature as we only differentiate person based on their name.

Items for the Tester to Verify

:question: Issue response

Team chose [response.Rejected]

• [x] I disagree

Reason for disagreement: [I think the bug is valid feature flaw, the TABS will facilitate group leaders to manage members. So a valid use case could be:
The team leaders sending emails to members referring to the system.
Therefore, it is not quite reasonable for 2 students to have the same email without any alerts upon addition]

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