Add wren.sln, wren.vcxproj, and wren_lib.vcxproj with Debug/Release and Win32/x64 configurations targeting v141 toolset, along with .vcxproj.filters for source organization. Update .gitignore to exclude .vs/ and obj/ directories. Modify build_libuv_windows in util/libuv.py to accept an arch parameter and pass x86/x64 to vcbuild.bat.
Building on windows
Building the wren project requires python2 to available in the path as python, in order to download and build the libuv dependency. The download and build of libuv is done as a pre-build step by the solution.