Add command: able to add people with same phone no.

[nus-pe-bot]

expected behaviour: no to people should share the same phone no. actual behaviour: able to add two people with the same phone no.

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_{[original: nus-cs2103-AY2324S2/pe-interim#1658] [original labels: type.FunctionalityBug severity.Low]}

[Jaspertzx]

Team's Response

This is an accepted behaviour, we did not specify in the User Guide that a Client must have a unique phone number. This is because some Clients may share the same phone number (e.g. company phone number, parent-child where the child is using the parent's phone number).

Duplicate status (if any):

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