Add conan package

[Randalphwa]

Migrated from the original repository
Original issue: serge-sans-paille/frozen#107
Originally reported by: @peter-moran

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It would be great to have a conan package for this. It's not too hard since this is a header only library.

This would include:

• Write source() to pull files from git
• Handle versioning info via git
• Add ability for run() to perform tests
• Package all header files

This is pretty easy and I could do it myself.