find the area of a rhombus in ruby

main.rb

Explanation:
In a rhombus, the diagonals intersect at 90-degrees and bisect each other, thus we can use the formula:

`Area = (diagonal1 * diagonal2) /2`

where `diagonal1` and `diagonal2` are the lengths of the two diagonals of the rhombus. The function `rhombus_area()` takes these two diagonals as inputs and returns the calculated area.
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