Fix for issue #8, added ASCII to HEX and HEX to ASCII converters

[Paradoxis]

Tested using the following input:

ASCII to HEX

Say Hello to My Little Friend -> 5361792048656c6c6f20746f204d79204c6974746c6520467269656e64

HEX to ASCII

5361792048656c6c6f20746f204d79204c6974746c6520467269656e64 -> Say Hello to My Little Friend
53 61 79 20 48 65 6c 6c 6f 20 74 6f 20 4d 79 20 4c 69 74 74 6c 65 20 46 72 69 65 6e 64 -> Say Hello to My Little Friend
53-61-79-20-48-65-6c-6c-6f-20-74-6f-20-4d-79-20-4c-69-74-74-6c-65-20-46-72-69-65-6e-64 -> Say Hello to My Little Friend
\x53\x61\x79\x20\x48\x65\x6c\x6c\x6f\x20\x74\x6f\x20\x4d\x79\x20\x4c\x69\x74\x74\x6c\x65\x20\x46\x72\x69\x65\x6e\x64 -> Say Hello to My Little Friend 

[izzy]

Thanks for your PR. Just looking at it it seems fine, didn't have time to test though.

There's a few things for code quality that could be better though. There's a few tabs and mixed tabs/spaces which garble the code indentation. Other than that I can't see any problems that'd prevent merging it.

[Paradoxis]

@mkzero oh sorry about that, my editor probably couldn't figure out what the code style was, adding an editorconfig could be useful for future pull requests