added Roman-to-Decimal into README

Projects/Roman-to-Decimal-Convertor.md

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+# Roman to Decimal numbers Convertor
+
+**Tier:** 1-Intermediate
+
+The purpose of this app is to allow the user put in practice both, algorithmic and Web Development knowledge by creating a Roman to Decimal numbers converter app.
+
+The numeric system represented by Roman numerals originated in ancient Rome and remained the
+usual way of writing numbers throughout Europe well into the Late Middle Ages.
+Roman numerals, as used today, employ seven symbols, each with a fixed integer value.
+
+See the below table with _Symbol - Value_
+
+-   I - 1
+-   V - 5
+-   X - 10
+-   L - 50
+-   C - 100
+-   D - 500
+-   M - 1000
+
+## User Stories
+
+-   [ ] User should be able to enter one Roman number in an input field
+-   [ ] User could see the results in a single output field containing the decimal (base 10) equivalent of the the roman number that was entered by pressing a button
+-   [ ] If a wrong symbol is entered, the User should see an error
+
+## Bonus features
+
+-   [ ] User could see the conversion to be made automatically as I type
+-   [ ] User should be able to convert from decimal to Roman (vice-versa)
+
+## Trello Board
+
+pending...
+
+## Useful links and resources
+
+-   [An explanation of Roman Numbers](https://en.wikipedia.org/wiki/Roman_numerals)
+
+## Example projects
+
+Try not to view this until you've developed your own solution:
+
+-   [Roman Number Converter](https://www.calculatorsoup.com/calculators/conversions/roman-numeral-converter.php)