README.md in trackler-2.2.1.100

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 On the web we use hexadecimal to represent colors, e.g. green: 008000,
 teal: 008080, navy: 000080).
 
 The program should handle invalid hexadecimal strings.
 
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 ## Getting Started
 For installation and learning resources, refer to the
 [exercism help page](http://exercism.io/languages/ocaml).
 
 ## Installation