added the roman numeral converter project link

Author: codewithmide

README.md

@@ -4,4 +4,6 @@ This is it — time to put my new JavaScript skills to work. These projects are
 Complete these 5 JavaScript projects to earn the JavaScript Algorithms and Data Structures certification.
 
 ## Projects
-- [Palindrome Checker](https://github.com/codewithmide/JavaScript-Algorithms-and-Data-Structures-Projects/tree/master/Palindrome_Checker)
+- [Palindrome Checker](https://github.com/codewithmide/JavaScript-Algorithms-and-Data-Structures-Projects/tree/master/Palindrome_Checker)
+
+- [Roman Numeral Converter](https://github.com/codewithmide/JavaScript-Algorithms-and-Data-Structures-Projects/tree/master/Roman_Numeral_Converter)