message: README.md: add instructions to build on Windows
diff: @@ -74,6 +74,14 @@ Build for the iOS simulator on macOS:
  make ios_simulator install
  ```
  +#### Windows
  +
  +To build in Windows, open the VS2015 x64 Native Tools Command Prompt, go to the directory and do:
  +```
  +mkdir build && cd build
  +cmake ..
  +cmake --build .
  +```
  ### Build with external directory for plugins/integration_tests
  