Documenting Windows Build Minimum Requirements

[kab163]

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[kab163]

With the cmake fatal error message set, when I turn off the filesystem:

-- Setting C standard to 99
-- Checking for std::filesystem
-- std::filesystem NOT found, using POSIX
CMake Error at CMakeLists.txt:139 (message):
      Windows builds require the FileSystem to be enabled     and the C/C++ standard to be set to 17 or higher.     Please re-configure with UMPIRE_ENABLE_FILESYSTEM=ON,     with BLT_CXX_STD=c++17 and CMAKE_CXX_STANDARD=17. 


-- Configuring incomplete, errors occurred!
Error: Process completed with exit code 1.

So the cmake stuff seems to work.

Accidental approval