Enrich description of installation for C++ on Windows

[max-rosin]

Using vcpkg to properly build the required configurations of protobuf on Visual Studio (here VS 2017):

• Install vcpkg as per the documentation, e.g. clone via git the bootstrap as needed

• English Language pack needs to be installed for VS 2017 for vcpkg to work

• Create a new triplet file for the required combination of static library linking with dynamic runtime (usually needed for dynamic linking to still work): I had to create a file named x64-windows-static-md-v141.cmake in the triplets directory with the following content:

  set(VCPKG_TARGET_ARCHITECTURE x64)
  set(VCPKG_CRT_LINKAGE dynamic)
  set(VCPKG_LIBRARY_LINKAGE static)
  set(VCPKG_PLATFORM_TOOLSET "v141")

  Note: only need the v141 suffix and setting of VCPKG_PLATFORM_TOOLSET to ensure VS 2017 is selected if you have newer VS installed (like I had).

• Now the protobuf libraries can be built automatically using:

  vcpkg.exe install protobuf:x64-windows-static-md-v141

• Once built, they can be automatically used in building the examples by specifying the triplet and toolchain file from VCPKG on the cmake configuration command-line:

  cd examples
  mkdir wbuild
  cd wbuild
  cmake .. -DVCPKG_TARGET_TRIPLET=x64-windows-static-md-v141 -DCMAKE_TOOLCHAIN_FILE=../../../vcpkg/scripts/buildsystems/vcpkg.cmake -G 'Visual Studio 15 2017 Win64'
  cmake –build .

The CMAKE_TOOLCHAIN_FILE must point to your vcpkg directory, which in my example was parallel to the osi-sensor-model-packaging directory…

This might complain somewhat depending on cmake and compiler settings, but builds without problems (and should support release and debug builds out of the box).

_Originally posted by @pmai in https://github.com/OpenSimulationInterface/open-simulation-interface/pull/519#discussion_r648157494_

[max-rosin]

• [ ] Incorporate above information into the appropriate topic.

[Helloezzi]

I am very grateful for your help. @max-rosin

cd examples
mkdir build
cd build
cmake .. -DVCPKG_TARGET_TRIPLET=x64-windows -DCMAKE_TOOLCHAIN_FILE=c:/vcpkg/scripts/buildsystems/vcpkg.cmake
cmake --build .