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While in the instructions you're asking to add two roman numerals, in reality what you're asking is to write a function that decodes a roman numeral to a number. And there already are other katas that do that. You could simply copy that code here and pass this one.
MCMXC = 1990
MMVIII = 2008
So the sum of both is 3998, not 4218.
Why "MCMXC" + "MMVIII" !== 4218 ???
[ 1000, 100, 1000, 10, 100, 1000, 1000, 5, 1, 1, 1 ]