Install NodeJS from here https://nodejs.org/ and then install bower using the node package manager (npm) that comes with NodeJS:
npm install -g bower
Once git cloned, run the following commands having navugated to the relevant directory in the command line or terminal:
npm install
bower install
This will download all of the relevant dependencies you will need to get going.
To run the app, from the cmd line call the following:
npm start
Then navigate to "localhost:3000" and you should see the app.