git clone [email protected]:WebPlatformForEmbedded/Lightning-Demo-App.git
cd Lightning-Demo-App
npm install
Now please check if you can run index.html (using a web server or your IDE). If it works you're set up and ready to start building your app!
If you don't have a web server installed you could run instant-server from the directory:
sudo npm install -g http-server
http-server -c-1