Add roman numeral converter certification project

2-javascript-algorithms-datastructures/2-roman-numerals.js

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+const romanNumerals = ["M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"]
+const arabicNumerals = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1]
+function convertToRoman(num) {
+    const converted = [];
+    for (let item in arabicNumerals){
+        while (num >= arabicNumerals[item]){
+            converted.push(romanNumerals[item]);
+            num = num - arabicNumerals[item];
+        }
+    }
+    return converted.join("")
+}
+
+let test1 = convertToRoman(36); //XXXVI
+let test2 = convertToRoman(2014);//MMXIV
+let test3 = convertToRoman(9);//IX
+let test4 = convertToRoman(3999);//MMMCMXCIX