message: Add build instructions, for Mac
diff: @@ -65,6 +65,17 @@ make -C build -j $(nproc)
  # locate the executables at OpenGothic/build/opengothic
  ```
  +### Build on MacOS
  +```bash
  +brew install glslang
  +git clone --recurse-submodules https://github.com/Try/OpenGothic.git
  +cd OpenGothic
  +cmake -H. -Bbuild -DCMAKE_BUILD_TYPE:STRING=RelWithDebInfo
  +cmake --build ./build --target Gothic2Notr
  +
  +# locate the executables at OpenGothic/build/opengothic
  +```
  +
  ### Gameplay video
  [![Video](https://img.youtube.com/vi/R9MNhNsBVQ0/0.jpg)](https://www.youtube.com/watch?v=R9MNhNsBVQ0)
  [![Video](https://img.youtube.com/vi/6BvwNkPMbwM/0.jpg)](https://www.youtube.com/watch?v=6BvwNkPMbwM)
  