Add roman numerals solution to 08-03-2018 (#50)

Author: alabeduarte

08-03-18/roman-numerals/.nvmrc

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+v9.2.0

08-03-18/roman-numerals/README.md

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+## Roman Numerals
+
+## Problem Description
+
+The Romans were a clever bunch. They conquered most of Europe and ruled it for
+hundreds of years. They invented concrete and straight roads and even bikinis.
+One thing they never discovered though was the number zero. This made writing
+and dating extensive histories of their exploits slightly more challenging, but
+the system of numbers they came up with is still in use today. For example the
+BBC uses Roman numerals to date their programmes.
+
+The Romans wrote numbers using letters - I, V, X, L, C, D, M. (notice these
+letters have lots of straight lines and are hence easy to hack into stone
+tablets).
+
+The Kata says you should write a function to convert from normal numbers to
+Roman Numerals. E.g.:
+
+   1  -> I
+   10 -> X
+   7  -> VII
+
+For a full description of how it works, take a look at
+https://en.wikipedia.org/wiki/Roman_numerals
+
+There is no need to be able to convert numbers larger than about 3000 (the
+Romans themselves didn't tend to go any higher). Note that you can't write
+numerals like "IM" for 999. Wikipedia says: Modern Roman numerals (…) are
+written by expressing each digit separately starting with the left most digit
+and skipping any digit with a value of zero. To see this in practice, consider
+the (…) example of 1990. In Roman numerals 1990 is rendered: 1000=M, 900=CM,
+90=XC; resulting in MCMXC. 2008 is written as 2000=MM, 8=VIII; or MMVIII.
+
+Here are a few more examples you can use as test cases:
+
+1954 -> MCMLIV
+1990 -> MCMXC
+2014 -> MMXIV
+
+# Extension:
+
+Write a function to convert in the other direction, i.e. numeral to digit.