added code for converting integer to roman representation of number

snippets/intToRoman.md

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+---
+title: intToRoman
+tags: integer,roman
+---
+
+### Convert Integer to Roman Number
+
+Following snippet is useful for converting integer number into roman number.
+
+***Note:-*** This code is only useful for number between 1 and 3999.
+according to Wikipedia the largest number you can represent in Roman is 3999. [click here](https://en.wikipedia.org/wiki/Roman_numerals)
+
+```js
+function intToRoman(num) {
+  const lookup = {M:1000,CM:900,D:500,CD:400,C:100,XC:90,L:50,XL:40,X:10,IX:9,V:5,IV:4,I:1};
+  let roman = '';
+  for (let i in lookup ) {
+    while ( num >= lookup[i] ) {
+      roman += i;
+      num -= lookup[i];
+    }
+  }
+  return roman;
+}
+```
+
+```js
+intToRoman(11); // XI
+intToRoman(03); // III
+intToRoman(1998) // MCMXCVIII
+```