message: doc: Add the missing build directory in Windows instructions
diff: @@ -84,6 +84,8 @@ OPENCV_PATH=C:\opencv\build\x64\vc14\bin
  - Generate the VisualStudio solution
  ```console
  cd aditof_sdk
  +mkdir build
  +cd build
  cmake -DCMAKE_PREFIX_PATH="C:\projects\aditof-sdk\deps\glog\build_0_3_5\local_path\glog;C:\projects\aditof-sdk\deps\protobuf\build_3_9_0\local_path\protobuf;C:\projects\aditof-sdk\deps\libwebsockets\build_3_1\local_path\websockets" -G "Visual Studio 14 2015 Win64" -DOPENSSL_INCLUDE_DIRS="C:\OpenSSL-Win64\include" -DWITH_EXAMPLES=on ..
  ```
  - Open 'adi_tof_project.sln' generated in 'aditof_sdk\build' in MS Visual Studio 2015
  