Add instructions for `npm install` on windows.
Add instructions for `npm install` on windows.
mrpau/installers,learningequality/installers,learningequality/ka-lite-installers,benjaoming/installers,ruimalheiro/installers,ruimalheiro/installers,MCGallaspy/installers,MCGallaspy/installers,mrpau/installers,benjaoming/installers,MCGallaspy/installers,benjaoming/installers,learningequality/installers,ruimalheiro/installers,mrpau/installers,benjaoming/installers,learningequality/installers,learningequality/ka-lite-installers,learningequality/installers,learningequality/ka-lite-installers,ruimalheiro/installers,MCGallaspy/installers,learningequality/ka-lite-installers,mrpau/installers