`add` Command: Does not pick up on additional markers

[Hansel-K]

For the add command, the application does not pick up on additional markers being added to the command.

The UG says "The CATEGORY and DESCRIPTION cannot contain d/ and t/", but no error is thrown when the user does so. Is it more of instructing the users not to do so or saying that doing so will throw an error?

[nus-pe-script]

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Team's Response

Description in the UG is to prevent potential error due to parsing catching the wrong flags, and we believe that such inputs will only be done by users by accident on rare occasions, but we will work on ensuring duplicate flags are caught and handled appropriately. Thank you for bringing this up and we accept the bug.

Items for the Tester to Verify

❓ Issue severity

Team chose [severity.Low]
Originally [severity.Medium]

• I disagree

Reason for disagreement: [replace this with your explanation]

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