First of all you will need node installed. You can get it from nodes official website and all the instructions are on the same page.
Once you have have node up and running you will need to install all
dependencies. First of all in your terminal or commandline (if using windows run
CMD as administrator) navigate to the directory which has package.json file.
Once you are there just run:
npm install
If everything was fine and installed succesfully, in your shell navigate to
./bin/ directory of the project and run:
node www
After this step you should be able to see project being live in browser at http://localhost:3000