Updated compatibility with IDC

[pcaires]

Was attempting to run the CPUGPU/main.cpp file.
In my Intel developer cloud instance, the compiler was not able to find ext::oneapi::reduction so it was replaced by just reduction

CPUGPU/main.cpp line 509
- auto sums = ext::oneapi::reduction(correct_a, ext::oneapi::plus<>());
+ auto sums = reduction(correct_buf,h,plus<>());

Also:

• Added a .gitignore
• Added a data folder with a readme pointing to the location of the datasets
• Slightly modified the build script