Removed my idea of how I thought it might have run better because I d…

…on't think it is actually better anymore.

Update README.md

Streamlined the entry function and ...

removed system pause since it's Windows specific.

Added Makefile for compilation.

Switched to MPIR for supporting larger decimal expansion on Windows.

Also, added supporting code in ChudnovskyPiBS class for what I thought would be the most efficient way to handle 10^9 decimal places at the time.

Changed to allow inputting the number of digits to calculate.

Switched back to the implementation of binary splitting without barri…

…ers on main-worker-threads.

Refactoring.

Added post-build event to copy DLLs to target (for "Relase - x64" con…

…figuration).

Add project files.