New Idea: Hexadecimal converter

Projects/1-Beginner/HexToDec.md

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+# HexToDec
+
+**Tier:** 1-Beginner
+
+The hexadecimal is a numbering system widely used in computing. 
+It is important that developers understand hexadecimal, or base 16 mathematics.
+
+The goal of HexToDec is to practice the creation of algorithms to manage to pass from an input in hexadecimal to an output in decimal.
+
+HecToDec allows the user to enter strings up to 4 hexadecimal digits, 0, 1, 2, etc and A, B, etc, in any order, then displays its decimal equivalent.
+
+This challenge requires that the developer implementing it follow these constraints:
+
+-   Arrays may not be used to contain the hexadecimal digits entered by the user
+-   Determining the decimal equivalent of a particular hexadecimal digit in the sequence must be calculated using a single mathematical function
+
+## User Stories
+
+-   [ ] User can enter up to 4 hexadecimal digits in one input field
+-   [ ] User views the results in a single output field containing the decimal (base 10) equivalent of the hexadecimal number that was entered
+
+## Bonus features
+
+-   [ ] User can enter a variable number of hexadecimal digits
+-   [ ] User can enter a negative hexadecimal number
+
+## Useful links and resources
+
+[Hexadecimal](https://en.wikipedia.org/wiki/Hexadecimal)
+
+## Example projects
+
+Try not to view this until you've developed your own solution:
+
+-   [Convert Hexadecimal to Decimal in Python](https://www.delftstack.com/howto/python/hex-to-decimal-python/)
+-   [Python program to convert hex string to decimal](https://www.geeksforgeeks.org/python-program-to-convert-hex-string-to-decimal/)