Add Sum component

[allgrain464-ops]

No description provided.

[mateacademy-ai-mentor]

Review Summary

I am approving your solution. The Sum component uses a named export, applies default values for a and b, and renders the correct message with template literals. In App, all five required usages are present: a=2 b=3, a=-5 b=5, a=10, b=5, and with no props, and the JSX tags follow the one-line formatting rule for fewer than three attributes. Functionality works for the specified inputs and aligns with the task requirements.

Minor notes (non-blocking): consider ensuring your PR description includes the correct Demo link and mentioning any formatter settings used. Great job keeping the code clear and consistent!

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