Provide instructions how to deploy and run using PM2

[grtjn]

Can be categorized under 'Productionalizing' in the left-hand menu.

[grtjn]

This could be a useful starting point: https://github.com/marklogic-community/slush-marklogic-node/blob/master/app/templates/INSTALL.mdown

The gulp and roxy commands obviously don't work, but some have been replaced with npm commands..

[mariannemyers]

I recently ran into a situation where pm2 did not work on Windows 10. I was able to use the pm2-windows-startup package that seems to "wrap" pm2 so it works on Windows.

The steps that worked for this situation:
npm install -g pm2
pm2 start ecosystem.config.js --env production
npm install pm2-windows-startup -g
pm2-startup install
pm2 save