title: I can't setup a react apollo mongodb app => resolvers with mongo / mongoose / NO METEOR
body: <p>I'm currently <strong>learning Apollo</strong>, I'm a front end developer ( angular 1.5 over half a year for the background )
  I have a very little experience with mongodb, and also with apollo ( trhough a meteor app )</p>
  
  <p>I've read several times the Apollo doc, parsed Google with the keywords apollo, react, mongodb, resolvers, with various combinations ... ( no results )</p>
  
  <p>I need to build a little <strong>React</strong> app (POC) which handle <strong>query, mutations, and subscriptions</strong> which would persist data with mongodb ( or another DB, I indicate this one since this is only one I've worked with so far ).</p>
  
  <p>I <strong>cannot</strong> use <strong>Meteor</strong>.</p>
  
  <p>My problem is that I can't find proper examples for <strong>graphql resolver</strong> working with mongo for all cases I need ( query, sub, mutate).</p>
  
  <p>Would you have some <strong>boilerplate</strong> to provide , to help me to understand the mecanism ?</p>
  
  <p>Thanks.</p>