Express tutorial

[JaKXz]

I might pull together a tutorial for testing express and put it up on the website for folks to reference (the link to oauth2-server-pg should be a good starting point).

continued from from istanbuljs/nyc#755

cc @marcodsx @SuperFun99 @bcoe anyone want to take a crack at this?

Would it also help with: istanbuljs/nyc#621?

[bcoe]

don't have the cycles for this, but would love for someone to take a crack at it 😛

CC: @christiannwamba