C++ GET/POST, Diceapp and python diceapp

C++ GET/POST, plus diceapp. Also added READMEs for all sections with how to install/use the libraries used in the programs.

@bdonald25 
Don't pollute the global namespace with the entire C++ standard library.  Instead, if you really don't want to type out "std::vector<int>", put "using std::vector", and so on for each part of the standard library you're using.