Update README.md

README.md

 Command line tool using OpenImageDenoise https://www.openimagedenoise.org/ to denoise qlm_*.exr lightmaps generated by Qt Quick 3D.
 
-Needs an installation of OpenImageDenoise (which in turn needs TBB). If there is no CMake find package file, configure with OPENIMAGEDENOISE_ROOT=path, for example:
-
-qt-cmake -GNinja -DCMAKE_BUILD_TYPE=Release -DOPENIMAGEDENOISE_ROOT=c:/oidn .
+TODO only Windows is supported now. Run prepare_deps.bat first. Then qt-cmake-private -CMAKE_BUILD_TYPE=Release . and ninja.
+This gives a qlmdenoiser.exe with the 3rd party dependencies linked in statically.