Small Java application in charge of convert a valid Roman Numeral numeral into a Decimal Number.

Using Enum Types and Regular Expressions, made it with good practices like TDD, DDD, SOLID... project builded with Maven.

• I placed before V or X indicates one less, so four is IV (one less than 5) and 9 is IX (one less than 10).
• X placed before L or C indicates ten less, so forty is XL (10 less than 50) and 90 is XC (ten less than a hundred).
• C placed before D or M indicates a hundred less, so four hundred is CD (a hundred less than five hundred) and nine hundred is CM (a hundred less than a thousand).