Add multiply function

[pullfrog]

This PR adds a multiply function to index.js and includes a test case to verify it works correctly.

Changes

• Added multiply(a, b) function that returns the product of two numbers
• Updated module.exports to include the new function
• Added test case: multiply(3, 4) returns 12
• All tests pass ✓

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[colinhacks]

Please add a test for multiply with negative numbers too, like multiply(-3, 4) === -12

[pullfrog]

Added test for negative number multiplication and pushed changes.

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[pullfrog]

Added the test case for multiply(-3, 4) === -12 as requested. All tests pass.

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